Fix coverage reporting.

Author: ghengeveld

package.json

@@ -27,13 +27,13 @@
   ],
   "scripts": {
     "build": "rimraf lib && babel src -d lib --ignore '**/*spec.js'",
-    "test": "jest src/spec.js",
+    "test": "jest src/spec.js  --collectCoverageFrom=src/index.js",
     "test:watch": "npm run test -- --watch",
     "test:compat": "npm run test:backwards && npm run test:forwards && npm run test:latest",
     "test:backwards": "npm i react@16.3.1 react-dom@16.3.1 && npm test",
     "test:forwards": "npm i react@next react-dom@next && npm test",
     "test:latest": "npm i react@latest react-dom@latest && npm test",
-    "test:hook": "npm i react@16.7.0-alpha.0 react-dom@16.7.0-alpha.0 && jest src/useAsync.spec.js",
+    "test:hook": "npm i react@16.7.0-alpha.0 react-dom@16.7.0-alpha.0 && jest src/useAsync.spec.js --collectCoverageFrom=src/useAsync.js",
     "prepublishOnly": "npm run test:compat && npm run build"
   },
   "dependencies": {},