Use eslint-config-koa (#1105)

.eslintrc.yml

@@ -1,16 +1 @@
-# Support ES2016 features
-parser: babel-eslint
-
-extends: standard
-
-rules:
-  arrow-parens: [2, as-needed]
-  eqeqeq: 0
-  no-return-assign: 0 # fails for arrow functions
-  no-var: 2
-  semi: [2, always]
-  space-before-function-paren: [2, never]
-  yoda: 0
-  arrow-spacing: 2
-  dot-location: [2, "property"]
-  prefer-arrow-callback: 2
+extends: koa

package.json

@@ -48,8 +48,8 @@
     "vary": "^1.0.0"
   },
   "devDependencies": {
-    "babel-eslint": "^7.1.1",
     "eslint": "^3.17.1",
+    "eslint-config-koa": "^2.0.0",
     "eslint-config-standard": "^7.0.1",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^2.1.1",