add codecov and yarn

Author: jscottsmith

.gitignore

@@ -1,3 +1,4 @@
 node_modules
+coverage
 *dist
 npm-debug.log

package.json

@@ -12,13 +12,16 @@
     "dev-server": "node ./example/dist/server",
     "gh-pages": "NODE_ENV=production webpack --progress --colors",
     "test": "BABEL_ENV=test jest",
+    "test:watch": "BABEL_ENV=test jest --watch",
     "prettier": "prettier --tab-width 4 --single-quote --trailing-comma es5 --print-width 80 --write \"{src,examples,__tests__}/**/**/**/*.js\"",
     "prepublish": "babel ./src --out-dir ./lib --presets es2015,react,stage-0 --plugins babel-plugin-add-module-exports"
   },
   "jest": {
     "modulePaths": [
       "<rootDir>/src/"
-    ]
+    ],
+    "coverageDirectory": "./coverage/",
+    "collectCoverage": true
   },
   "keywords": [
     "react",
@@ -43,6 +46,7 @@
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.23.0",
     "babel-preset-stage-0": "^6.24.1",
+    "codecov": "^3.0.0",
     "cross-env": "^3.1.4",
     "css-loader": "^0.28.0",
     "express": "^4.14.1",