chore(package): update @sourcegraph/tslint-config to version 9.0.2 (#404)

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "@semantic-release/github": "^2.0.0",
     "@sourcegraph/prettierrc": "^1.1.0",
     "@sourcegraph/tsconfig": "^1.0.0",
-    "@sourcegraph/tslint-config": "^8.0.0",
+    "@sourcegraph/tslint-config": "^9.0.2",
     "@types/chai": "^4.0.0",
     "@types/chai-as-promised": "^7.1.0",
     "@types/glob": "^5.0.30",