Update cacheVersion in bundle.js

As requested by @vjeux, this moves the change to this file to a separate PR.

For more info see #2905.

local-cli/bundle.js

@@ -35,7 +35,7 @@ function getBundle(flags) {
     projectRoots: projectRoots,
     transformModulePath: require.resolve('../packager/transformer.js'),
     assetRoots: assetRoots,
-    cacheVersion: '2',
+    cacheVersion: '3',
     blacklistRE: blacklist(platform),
   };