Downgrade tap-spec

The newer one has a deep dependency to a strip-bom that uses ES6

Author: oliversalzburg

package.json

@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "eslint": "^3.0.1",
-    "tap-spec": "^2.1.0",
+    "tap-spec": "1",
     "tape": "^3.0.3"
   },
   "strider": {