Build: fix markerPattern and ticketPattern regexes in package.json

Commit messages used to fail the style check if they contained a word
starting with "ref", like reformat or reference, in their message body.

Close gh-3437
Ref jzaefferer/commitplease#91

package.json

@@ -91,7 +91,7 @@
       "Traversing",
       "Wrap"
     ],
-    "markerPattern": "^((clos|fix|resolv)(e[sd]|ing))|(refs?)",
-    "ticketPattern": "^((Closes|Fixes) ([a-zA-Z]{2,}-)[0-9]+)|(Refs? [^#])"
+    "markerPattern": "^((clos|fix|resolv)(e[sd]|ing))|^(refs?)",
+    "ticketPattern": "^((Closes|Fixes) ([a-zA-Z]{2,}-)[0-9]+)|^(Refs? [^#])"
   }
 }