Add a note about typings install (angular#437)

Devs may need to run `typings install` before npm run build.
stillzombie · Aug 15, 2016 · 13a5e1e · 13a5e1e
1 parent b38b5fd
commit 13a5e1e
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diff --git a/CONTRIBUTOR.md b/CONTRIBUTOR.md
@@ -34,3 +34,8 @@ $ npm run docs
 $ cd docs
 $ firebase deploy
 ```
+
+## Error TS6053: File '...index.d.ts' not found.
+
+You may need to run `typings install`
+