add husky + lint-staged (#7)

Author: geotrev

.circleci/config.yml

@@ -18,5 +18,4 @@ jobs:
             - node_modules
           key: v1-dependencies-{{ checksum "package.json" }}
 
-      - run: npm run lint
       - run: npm test

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+node_modules/lint-staged/bin/lint-staged.js