chore(package): update eslint to version 6.8.0

Closes #74

Author: greenkeeper[bot]

package.json

@@ -62,7 +62,7 @@
     "coveralls": "^3.0.2",
     "css-loader": "^0.28.0",
     "element-ui": "^2.4.11",
-    "eslint": "^5.9.0",
+    "eslint": "^6.8.0",
     "eslint-config-guo": "^0.8.0",
     "eslint-friendly-formatter": "^4.0.1",
     "eslint-loader": "^2.0.0",