Update eslint

Author: Ruben Bridgewater

package.json

@@ -21,7 +21,7 @@
     "coverage": "nyc report --reporter=html",
     "benchmark": "node benchmarks/multi_bench.js",
     "test": "nyc --cache mocha ./test/*.js ./test/commands/*.js --timeout=8000",
-    "posttest": "eslint . --fix && npm run coverage",
+    "lint": "eslint . --fix && npm run coverage",
     "compare": "node benchmarks/diff_multi_bench_output.js beforeBench.txt afterBench.txt"
   },
   "dependencies": {
@@ -36,7 +36,7 @@
     "bluebird": "^3.0.2",
     "coveralls": "^2.11.2",
     "intercept-stdout": "~0.1.2",
-    "eslint": "^2.5.0",
+    "eslint": "^3.5.0",
     "metrics": "^0.1.9",
     "mocha": "^2.3.2",
     "nyc": "^8.3.0",