Fix HMR preset config path

Reviewed By: davidaurelio

Differential Revision: D3077935

fb-gh-sync-id: b1e89f9e34a505f0611cf8991afe4224d5a6f05d
shipit-source-id: b1e89f9e34a505f0611cf8991afe4224d5a6f05d

babel-preset/configs/hmr.js

@@ -16,7 +16,7 @@ var transformPath = require.resolve(hmrTransform);
 
 module.exports = function(options, filename) {
   var transform = filename
-      ? path.relative(path.dirname(filename), transformPath) // packager can't handle absolute paths
+      ? './' + path.relative(path.dirname(filename), transformPath) // packager can't handle absolute paths
       : hmrTransform;
   return {
     plugins: resolvePlugins([
@@ -32,4 +32,4 @@ module.exports = function(options, filename) {
       ]
     ])
   };
-}
+};