feat: Support both LICENSE.txt and LICENSE in license checker

license/license.go

@@ -44,6 +44,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 
 	const licenseLine1 = "// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved."
 	const defaultLicenseLine2 = "// See LICENSE.txt for license information."
+	const defaultLicenseLine2Alt = "// See LICENSE for license information."
 	const enterpriseLicenseLine2 = "// See ENTERPRISE-LICENSE.txt and SOURCE-CODE-LICENSE.txt for license information."
 	const sourceAvailableLicenseLine2 = "// See LICENSE.enterprise for license information."
 
@@ -109,7 +110,8 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			continue
 		}
 
-		if file.Comments[commentGroup].List[1].Text != licenseLine2 {
+		secondLine := file.Comments[commentGroup].List[1].Text
+		if secondLine != licenseLine2 && (licenseLine2 == defaultLicenseLine2 && secondLine != defaultLicenseLine2Alt) {
 			pass.Reportf(file.Comments[0].List[1].Pos(), "License wrong:\n\tseen:\n\t%s\n\t%s\n\n\texpected:\n\t%s\n\t%s", file.Comments[0].List[0].Text, file.Comments[0].List[1].Text, licenseLine1, licenseLine2)
 			continue
 		}