Bump should@^13.2.1

Author: xzyfer

package.json

@@ -43,7 +43,7 @@
     "gulp-tap": "^0.1.3",
     "mocha": "^5.0.4",
     "rimraf": "^2.4.3",
-    "should": "^8.3.1",
+    "should": "^13.2.1",
     "vinyl": "^2.1.0"
   }
 }