Move codecov dependency from package.json to .travis.yml file.

package-lock.json

@@ -181,12 +181,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "argv": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-      "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
-      "dev": true
-    },
     "aria-query": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz",
@@ -1435,17 +1429,6 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
-    "codecov": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.0.2.tgz",
-      "integrity": "sha512-9ljtIROIjPIUmMRqO+XuDITDoV8xRrZmA0jcEq6p2hg2+wY9wGmLfreAZGIL72IzUfdEDZaU8+Vjidg1fBQ8GQ==",
-      "dev": true,
-      "requires": {
-        "argv": "0.0.2",
-        "request": "^2.81.0",
-        "urlgrey": "0.4.4"
-      }
-    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -9037,12 +9020,6 @@
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
-    "urlgrey": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
-      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
-      "dev": true
-    },
     "use": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",