chore(package): update tap to version 12.0.0

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
     "proxyquire": "^2.0.0",
     "redis-mock": "^0.18.0",
     "standard": "^11.0.0",
-    "tap": "^11.0.0"
+    "tap": "^12.0.0"
   },
   "engines": {
     "node": "7"