chore(package): update remark-lint to version 7.0.0 (#151)

Co-authored-by: greenkeeper[bot] <23040076+greenkeeper[bot]@users.noreply.github.com>
Co-authored-by: Yidong Li <[email protected]>

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "react-dom": "^16.8.4",
     "react-test-renderer": "^16.8.6",
     "remark-cli": "^8.0.0",
-    "remark-lint": "^6.0.4",
+   "remark-lint": "^7.0.0",
     "remark-preset-lint-recommended": "^4.0.0",
     "ts-jest": "^25.1.0",
     "tslint": "^5.14.0",