Add missing dev_dependencies (#130)

diff --git a/pubspec.yaml b/pubspec.yaml
index d5ba45a..4368aaa 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -14,8 +14,10 @@
   dart_style: ^1.0.6
 
 dev_dependencies:
+  build: ^0.12.8
   build_runner: ^0.10.0
   build_web_compilers: ^0.4.0
+  glob: ^1.1.7
   test: ^1.3.0
   yaml: ^2.1.15