Update typescript-eslint monorepo to v1.12.0 (#103)

Author: renovate[bot]

package-lock.json

@@ -17,8 +17,8 @@
         "@babel/preset-typescript": "7.3.3",
         "@types/jest": "24.0.15",
         "@types/node": "12.6.2",
-        "@typescript-eslint/eslint-plugin": "1.11.0",
-        "@typescript-eslint/parser": "1.11.0",
+        "@typescript-eslint/eslint-plugin": "1.12.0",
+        "@typescript-eslint/parser": "1.12.0",
         "babel-jest": "24.8.0",
         "eslint": "6.0.1",
         "eslint-config-airbnb": "17.1.1",