use golang-dl release data

lib/installer.js

@@ -186,10 +186,9 @@ function getLatestVersion(version) {
 function getAvailableVersions() {
     return __awaiter(this, void 0, void 0, function* () {
         let rest = new restm.RestClient('setup-go');
-        let tags = (yield rest.get('https://api.github.com/repos/golang/go/git/refs/tags')).result || [];
-        return tags
-            .filter(tag => tag.ref.match(/go\d+\.[\w\.]+/g))
-            .map(tag => tag.ref.replace('refs/tags/go', ''));
+        let tags = (yield rest.get('https://golang.org/dl/?mode=json&include=all'))
+            .result || [];
+        return tags.map(tag => tag.version.replace('go', ''));
     });
 }
 function getPossibleVersions(version) {