Add support for Java 20

Author: marchof

LICENSE.md

@@ -1,7 +1,7 @@
 MIT License
 ===========
 
-Copyright 2021 Mountainminds GmbH & Co. KG
+Copyright 2021, 2022 Mountainminds GmbH & Co. KG
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

README.md

@@ -2,7 +2,7 @@ io.javaalmanac.javadoclink - Deep links for Javadoc
 ===================================================
 
 Small Java library to create deep links into generated Javadoc for all Java
-versions from 1.1 to 18.
+versions from 1.1 to 20.
 
 The library can create links for
 

src/main/java/io/javaalmanac/javadoclink/JavaDocLinkImpl.java

@@ -82,6 +82,7 @@ final class JavaDocLinkImpl implements JavaDocLink {
 		VERSIONS.put("17", VERSIONS.get("11"));
 		VERSIONS.put("18", VERSIONS.get("11"));
 		VERSIONS.put("19", VERSIONS.get("11"));
+		VERSIONS.put("20", VERSIONS.get("11"));
 	}
 
 	private final String base;

src/test/java/io/javaalmanac/javadoclink/JavaDocLinkTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2022 Mountainminds GmbH & Co. KG
+ * Copyright (c) 2021, 2022 Mountainminds GmbH & Co. KG
  * 
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -123,6 +123,7 @@ private boolean hasNoElement(Document doc, String element, String attr, String v
 		JDK_API_DOC.put("17", "https://docs.oracle.com/en/java/javase/17/docs/api/");
 		JDK_API_DOC.put("18", "https://docs.oracle.com/en/java/javase/18/docs/api/");
 		JDK_API_DOC.put("19", "https://download.java.net/java/early_access/jdk19/docs/api/");
+		JDK_API_DOC.put("20", "https://download.java.net/java/early_access/jdk20/docs/api/");
 	}
 
 }