chore(deps-dev): bump tslint from 5.20.1 to 6.1.2 (antvis#525)

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.1 to 6.1.2.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.1...6.1.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -87,7 +87,7 @@
     "source-map-support": "^0.5.9",
     "ts-loader": "^5.3.1",
     "ts-node": "^7.0.1",
-    "tslint": "^5.12.0",
+    "tslint": "^6.1.2",
     "tslint-config-airbnb": "^5.11.1",
     "tslint-config-prettier": "^1.18.0",
     "typescript": "^3.2.2",