Upgrade dartdoc to v0.12.0.

.packages

Index: .packages
diff --git a/.packages b/.packages
index 549acea1a8f73949e82ea22d9c5f477f9415c0ea..3c4fe9b423081f1717c324d4fd210ae1a635a32b 100644
--- a/.packages
+++ b/.packages
@@ -76,6 +76,7 @@ protobuf:third_party/pkg/protobuf/lib
 pub:third_party/pkg/pub/lib
 pub_semver:third_party/pkg/pub_semver/lib
 quiver:third_party/pkg/quiver/lib
+quiver_hashcode:third_party/pkg/quiver_hashcode/lib

[Bill Hesse, 2017/06/16 07:47:42]

This line is no longer needed.

 resource:third_party/pkg/resource/lib
 scheduled_test:third_party/pkg/scheduled_test/lib
 sdk_library_metadata:sdk/lib/_internal/sdk_library_metadata/lib
@@ -94,6 +95,7 @@ test:third_party/pkg/test/lib
 test_dart:tools/testing/dart
 testing:pkg/testing/lib
 test_reflective_loader:third_party/pkg/test_reflective_loader/lib
+tuple:third_party/pkg/tuple/lib
 typed_data:third_party/pkg/typed_data/lib
 typed_mock:pkg/typed_mock/lib
 unittest:third_party/pkg/unittest/lib