fix(main): keep build folder

Author: AlloVince

build/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

package.json

@@ -13,10 +13,10 @@
     "test": "npm run coverage",
     "crontab": "NODE_ENV=production babel-node ./src/crontab",
     "coverage": "nyc -a --reporter=lcov --reporter=text --reporter=html npm run ava",
-    "dev": "nodemon --exec babel-node --experimental-modules ./src/app.js",
+    "dev": "nodemon --exec babel-node ./src/app.js",
     "swagger": "rm -r ./build/* && npm run build && SWAGGER_VALID=1 node build/swagger.js",
     "swagger-dev": "rm -r ./build/* && npm run build && nodemon --ignore 'node_modules/*' --ignore '**/*.json' --exec babel-node src/swagger.js",
-    "lint": "./node_modules/.bin/eslint src/* --ext .js",
+    "lint": "eslint src/* --ext .js",
     "build": "babel -D -s -d build/ src/",
     "semantic-release": "semantic-release",
     "travis-deploy-once": "travis-deploy-once"