Remove the grinder dependency override (#58)

Author: nex3

pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   charcode: "^1.1.0"
   collection: ">=1.8.0 <2.0.0"
   crypto: "^2.0.0"
-  grinder: '^0.8.0'
+  grinder: '^0.8.6'
   http: ">=0.11.0 <0.13.0"
   js: "^0.6.0"
   meta: "^1.1.7"
@@ -36,9 +36,3 @@ dev_dependencies:
   shelf_test_handler: '^1.0.0'
   test_descriptor: '^1.2.0'
   tuple: '^1.0.0'
-
-dependency_overrides:
-  grinder:
-    git:
-      url: git://github.com/nex3/grinder.dart
-      ref: never