fix(deps): pin dependencies

Author: renovate-bot

package-lock.json

@@ -12,10 +12,10 @@
     "semantic-release": "ht2-release-public-circleci-lib"
   },
   "dependencies": {
-    "tslint": "^5.9.1",
-    "tslint-consistent-codestyle": "^1.11.1",
-    "tslint-immutable": "^4.5.1",
-    "typescript": "^2.8.1"
+    "tslint": "5.9.1",
+    "tslint-consistent-codestyle": "1.11.1",
+    "tslint-immutable": "4.5.1",
+    "typescript": "2.8.1"
   },
   "devDependencies": {
     "@ht2-labs/semantic-release": "1.0.31"