fix: Lower eslint dependency version

Author: zimme

package.json

@@ -18,7 +18,7 @@
     "babel-runtime": "^6.26.0",
     "common-tags": "^1.4.0",
     "dlv": "^1.1.0",
-    "eslint": "^4.15.0",
+    "eslint": "^4.0.0",
     "indent-string": "^3.2.0",
     "lodash.merge": "^4.6.0",
     "loglevel-colored-level-prefix": "^1.0.0",