feat(go): update license header format and configuratoin

Author: ZekiLiu

go/go.mod

@@ -6,7 +6,7 @@
 // "License"); you may not use this file except in compliance
 // with the License.  You may obtain a copy of the License at
 //
-// http://www.apache.org/licenses/LICENSE-2.0
+//   http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing,
 // software distributed under the License is distributed on an

licenserc.toml

@@ -64,3 +64,7 @@ excludes = [
   "cli/*.yml",
   "cli/*.toml",
 ]
+
+[mapping.DOUBLESLASH_STYLE]
+extensions = ['go']
+filenames = ['go.mod']