point to our documentation on plugins dependencies upgrade

maven-compat/src/site/apt/index.apt

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+~~ Licensed to the Apache Software Foundation (ASF) under one
+~~ or more contributor license agreements.  See the NOTICE file
+~~ distributed with this work for additional information
+~~ regarding copyright ownership.  The ASF licenses this file
+~~ to you 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.
+
+ -----
+ Introduction
+ -----
+ Hervé Boutemy
+ -----
+ 2016-05-29
+ -----
+
+Maven Compat
+
+ Maven2 classes maintained as compatibility layer for plugins that need to keep Maven2 compatibility.
+
+ Plugins should avoid these classes and be updated to use only Maven3 dependencies (and require Maven3): see
+ {{{https://cwiki.apache.org/confluence/display/MAVEN/Plugin+migration+to+Maven3+dependencies} Plugin migration to Maven3 dependencies}}
+ documentation to get hints on how to make the update.