chore(package): update eslint to version 6.0.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "@types/jest": "23.3.2",
     "@types/eslint": "4.16.3",
     "@types/node": "^10.10.1",
-    "eslint": "5.6.0",
+    "eslint": "6.0.0",
     "jest": "23.6.0",
     "ts-jest": "23.10.1",
     "semantic-release": "15.9.16",