Refactor repository in package.json

Author: wooorm

package.json

@@ -8,7 +8,7 @@
     "util",
     "html"
   ],
-  "repository": "https://github.com/syntax-tree/hast-util-to-html",
+  "repository": "syntax-tree/hast-util-to-html",
   "bugs": "https://github.com/syntax-tree/hast-util-to-html/issues",
   "author": "Titus Wormer <tituswormer@gmail.com> (http://wooorm.com)",
   "contributors": [