build: keep jdk 1.8 on github actions. Will add more jdk progressively

Author: jknack

.github/workflows/build-matrix.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java_version: [1.8, 11, 13, 15, 17]
+        java_version: [1.8]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:

handlebars/src/main/java/com/github/jknack/handlebars/helper/HelperFunction.java

@@ -1,3 +1,20 @@
+/**
+ * Copyright (c) 2012-2015 Edgar Espina
+ *
+ * This file is part of Handlebars.java.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.github.jknack.handlebars.helper;
 
 import java.lang.annotation.Retention;
@@ -12,6 +29,7 @@
 
     /**
      * The name used to invoke the decorated helper function in a handlebars template.
+     * @return Name or null/empty to use default method name.
      */
     String value();