chore(deps): pin dependencies (#2)

renovate[bot] · kbrandwijk · commit dc419b267345 · 2018-01-04T07:15:15.000+01:00
diff --git a/package.json b/package.json
@@ -18,8 +18,8 @@
     "reify": "^0.13.5"
   },
   "devDependencies": {
-    "@types/node": "^8.5.1",
-    "tslint": "^5.8.0",
-    "typescript": "^2.6.2"
+    "@types/node": "8.5.5",
+    "tslint": "5.8.0",
+    "typescript": "2.6.2"
   }
 }
