exclude src/shared/** from coverage reports

mocha.coverage.opts

@@ -1,5 +1,5 @@
 --require babel-register
 --require reify
- --recursive
+--recursive
 ./**/__test__.js
 test/*/index.js

package.json

@@ -83,7 +83,8 @@
       "src/**/*.js"
     ],
     "exclude": [
-      "src/**/__test__.js"
+      "src/**/__test__.js",
+      "src/shared/**"
     ]
   },
   "babel": {