chore: run eslint --fix against commits (#1912)

package.json

@@ -11,7 +11,7 @@
     "build": "npm run build-browser & npm run build-min",
     "build-browser": "node bundler/cli browser.js -output mithril.js",
     "build-min": "node bundler/cli browser.js -output mithril.min.js -minify",
-    "danger": "danger",
+    "precommit": "lint-staged",
     "lintdocs": "node docs/lint",
     "gendocs": "node docs/generate",
     "lint": "eslint . || true",
@@ -26,16 +26,26 @@
     "postversion": "git push --follow-tags"
   },
   "devDependencies": {
+    "@alrra/travis-scripts": "^3.0.1",
     "benchmark": "^2.1.4",
     "danger": "^1.0.0",
     "dedent": "^0.7.0",
     "eslint": "^3.19.0",
+    "gh-pages": "^0.12.0",
+    "husky": "^0.14.3",
     "istanbul": "^0.4.5",
     "locater": "^1.3.0",
     "marked": "^0.3.6",
+    "lint-staged": "^4.0.2",
     "pinpoint": "^1.1.0"
   },
   "bin": {
     "ospec": "./ospec/bin/ospec"
+  },
+  "lint-staged": {
+    "*.js": [
+      "eslint . --fix",
+      "git add"
+    ]
   }
 }