pubspec cleanup.

pubspec.yaml

@@ -7,9 +7,6 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-#  flutter:
-#    sdk: flutter
-#  path: ^1.6.0
   logging: '>=0.11.3+2 <2.0.0'
   crypto: '>=2.0.0 <4.0.0'
   pointycastle: '>=3.0.0 <4.0.0'
@@ -18,8 +15,6 @@ dependencies:
   meta: '>=1.0.0 <2.0.0'
   clock: '>=1.0.0 <2.0.0'
   convert: '>=2.0.0 <4.0.0'
-  #isolate: '>=2.0.3 <3.0.0'
-  # using forked null safety release until it is merged https://github.com/dart-lang/isolate/pull/45
   isolates: '>=3.0.0 <4.0.0'
   path: '>=1.6.0 <2.0.0'
   quiver: '>=2.1.0 <4.0.0'