chore(package): update tap to version 12.6.5

Closes #16

Author: greenkeeper[bot]

package.json

@@ -13,7 +13,7 @@
   "dependencies": {},
   "devDependencies": {
     "coveralls": "^3.0.0",
-    "tap": "^11.0.0"
+    "tap": "^12.6.5"
   },
   "keywords": [
     "Rust",