Update dev dependencies on pkg:http and build_version (#1908)

Author: kevmoo

pubspec.yaml

@@ -31,13 +31,13 @@ dependencies:
 dev_dependencies:
   build: ^1.0.1
   build_runner: ^1.0.0
-  build_version: ^1.0.0
+  build_version: ^2.0.0
   coverage: ^0.12.4
   dhttpd: ^3.0.0
   glob: ^1.1.5
   grinder: ^0.8.2
   io: ^0.3.0
-  http: ^0.11.0
+  http: ^0.12.0
   meta: ^1.0.0
   test: ^1.3.0