upgrade eslint deps and add precommit hook

Author: chrisbreiding

package.json

@@ -6,6 +6,8 @@
   "scripts": {
     "build-dev": "node ./scripts/build-dev.js",
     "build-prod": "node ./scripts/build-prod.js",
+    "lint": "eslint --fix src/*.js  src/*.jsx",
+    "precommit": "npm run lint",
     "prepublish": "npm run build-prod",
     "release": "releaser",
     "start": "node ./scripts/watch.js --port 8888",
@@ -29,14 +31,14 @@
   },
   "devDependencies": {
     "@cypress/releaser": "0.1.12",
-    "babel-eslint": "^7.0.0",
+    "babel-eslint": "^8.0.3",
     "chai": "^3.5.0",
     "chai-enzyme": "0.5.1",
     "enzyme": "2.4.1",
-    "eslint": "^3.6.1",
+    "eslint": "^4.12.1",
     "eslint-plugin-cypress-dev": "^1.1.1",
-    "eslint-plugin-mocha": "^4.5.1",
-    "eslint-plugin-react": "^6.3.0",
+    "eslint-plugin-mocha": "^4.11.0",
+    "eslint-plugin-react": "^7.5.1",
     "jsdom": "^9.5.0",
     "lodash": "^4.0.0",
     "react": "15.3.2",