notepad3: Enhance checkver

Author: refack

bucket/notepad3.json

@@ -55,7 +55,7 @@
         "Notepad3.ini"
     ],
     "checkver": {
-        "url": "https://github.com/rizonesoft/Notepad3/releases",
+        "github": "https://github.com/rizonesoft/Notepad3",
         "regex": "tag/RELEASE_([\\d.]+)"
     },
     "autoupdate": {