chore(package): update eslint to version 6.4.0

Closes #126

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "@commitlint/config-conventional": "^7.0.1",
     "commitizen": "^3.0.5",
     "cz-conventional-changelog": "^2.1.0",
-    "eslint": "^5.0.1",
+    "eslint": "^6.4.0",
     "eslint-config-finn": "^3.0.1",
     "eslint-config-finn-prettier": "^3.0.2",
     "eslint-plugin-import": "^2.14.0",