Update .gitignore

packages/postman/.gitignore

@@ -1,7 +1,31 @@
-# https://dart.dev/guides/libraries/private-files
-# Created by `dart pub`
-.dart_tool/
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
 
-# Avoid committing pubspec.lock for library packages; see
-# https://dart.dev/guides/libraries/private-files#pubspeclock.
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
 pubspec.lock
+**/doc/api/
+.dart_tool/
+.packages
+build/
+**/golden/**/failures/
+coverage/