Make eslint-config a dev dependency

Author: mantoni

package-lock.json

@@ -19,13 +19,13 @@
     "extends": "@studio"
   },
   "dependencies": {
-    "@studio/eslint-config": "^1.0.2",
     "@studio/log": "^2.0.0",
     "@studio/ndjson": "^2.0.0"
   },
   "devDependencies": {
     "@sinonjs/referee-sinon": "^4.1.0",
     "@studio/changes": "^1.5.2",
+    "@studio/eslint-config": "^1.0.2",
     "eslint": "^5.0.1",
     "mocha": "^5.2.0"
   }