chore(package): update eslint to version 6.8.0

Closes #60

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "@babel/register": "^7.0.0",
     "ava": "^1.0.1",
     "coveralls": "^3.0.2",
-    "eslint": "^5.11.0",
+    "eslint": "^6.8.0",
     "eslint-config-i-am-meticulous": "^11.0.0",
     "eslint-plugin-import": "^2.2.0",
     "markdown-it": "^8.2.2",