Update pubspec.yaml

Author: bkonyi

dwds/pubspec.yaml

@@ -58,7 +58,6 @@ dev_dependencies:
   js: '>=0.6.4 <0.8.0'
   pubspec_parse: ^1.2.0
   puppeteer: ^3.1.1
-  stream_channel: ^2.1.2
   test: ^1.21.6
   test_common:
     path: ../test_common