Update pubspec

No idea, what is going on.

pubspec.lock

@@ -1,20 +1,6 @@
 # Generated by pub
 # See https://www.dartlang.org/tools/pub/glossary#lockfile
 packages:
-  analyzer:
-    dependency: transitive
-    description:
-      name: analyzer
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.32.4"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.5.0"
   async:
     dependency: transitive
     description:
@@ -49,7 +35,7 @@ packages:
       name: convert
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.2"
+    version: "2.1.1"
   crypto:
     dependency: transitive
     description:
@@ -57,13 +43,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.6"
-  csslib:
-    dependency: transitive
-    description:
-      name: csslib
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.14.5"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -74,27 +53,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  front_end:
-    dependency: transitive
-    description:
-      name: front_end
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.4"
-  glob:
-    dependency: transitive
-    description:
-      name: glob
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.7"
-  html:
-    dependency: transitive
-    description:
-      name: html
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.13.3+3"
   http:
     dependency: "direct main"
     description:
@@ -102,13 +60,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.11.3+17"
-  http_multi_server:
-    dependency: transitive
-    description:
-      name: http_multi_server
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.5"
   http_parser:
     dependency: transitive
     description:
@@ -123,41 +74,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.15.7"
-  io:
-    dependency: transitive
-    description:
-      name: io
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.3"
-  js:
-    dependency: transitive
-    description:
-      name: js
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.6.1+1"
-  json_rpc_2:
-    dependency: transitive
-    description:
-      name: json_rpc_2
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.9"
-  kernel:
-    dependency: transitive
-    description:
-      name: kernel
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.4"
-  logging:
-    dependency: transitive
-    description:
-      name: logging
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.11.3+2"
   matcher:
     dependency: transitive
     description:
@@ -172,41 +88,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.6"
-  mime:
-    dependency: transitive
-    description:
-      name: mime
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.6+2"
-  multi_server_socket:
-    dependency: transitive
-    description:
-      name: multi_server_socket
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.2"
-  node_preamble:
-    dependency: transitive
-    description:
-      name: node_preamble
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.4.4"
-  package_config:
-    dependency: transitive
-    description:
-      name: package_config
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.5"
-  package_resolver:
-    dependency: transitive
-    description:
-      name: package_resolver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.4"
   path:
     dependency: "direct main"
     description:
@@ -220,82 +101,19 @@ packages:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.0"
+    version: "0.4.1"
-  plugin:
-    dependency: transitive
-    description:
-      name: plugin
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.2.0+3"
-  pool:
-    dependency: transitive
-    description:
-      name: pool
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.6"
-  pub_semver:
-    dependency: transitive
-    description:
-      name: pub_semver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.4.2"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0+1"
+    version: "2.0.1"
-  shelf:
-    dependency: transitive
-    description:
-      name: shelf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.7.3+3"
-  shelf_packages_handler:
-    dependency: transitive
-    description:
-      name: shelf_packages_handler
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.4"
-  shelf_static:
-    dependency: transitive
-    description:
-      name: shelf_static
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.2.8"
-  shelf_web_socket:
-    dependency: transitive
-    description:
-      name: shelf_web_socket
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.2.2+4"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
-  source_map_stack_trace:
-    dependency: transitive
-    description:
-      name: source_map_stack_trace
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.5"
-  source_maps:
-    dependency: transitive
-    description:
-      name: source_maps
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.10.7"
   source_span:
     dependency: transitive
     description:
@@ -331,13 +149,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
-  test:
+  test_api:
     dependency: transitive
     description:
-      name: test
+      name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "0.2.1"
   typed_data:
     dependency: transitive
     description:
@@ -345,13 +163,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.6"
-  utf:
-    dependency: transitive
-    description:
-      name: utf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.0+5"
   uuid:
     dependency: "direct main"
     description:
@@ -366,27 +177,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.8"
-  vm_service_client:
-    dependency: transitive
-    description:
-      name: vm_service_client
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.2.6"
-  watcher:
-    dependency: transitive
-    description:
-      name: watcher
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.7+10"
-  web_socket_channel:
-    dependency: transitive
-    description:
-      name: web_socket_channel
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.9"
   yaml:
     dependency: "direct main"
     description:
@@ -395,5 +185,5 @@ packages:
     source: hosted
     version: "2.1.15"
 sdks:
-  dart: ">=2.0.0-dev.68.0 <3.0.0"
+  dart: ">=2.0.0 <3.0.0"
   flutter: ">=0.1.4 <2.0.0"