chore: pin eslint to 4.3.0

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "chai": "^4.1.0",
     "coveralls": "^2.11.9",
-    "eslint": "^4.3.0",
+    "eslint": "4.3.0",
     "istanbul": "^0.4.4",
     "mocha": "^3.5.0",
     "mocha-lcov-reporter": "^1.2.0",