Prepare next development version

src/site/markdown/overview/changelog-old.md

@@ -4,6 +4,20 @@ Previous versions of PMD can be downloaded here:
 http://sourceforge.net/projects/pmd/files/pmd/
 
 
+## 29-April-2017 - 5.6.1
+
+The PMD team is pleased to announce PMD 5.6.1.
+
+This is a bug fixing release.
+
+### Fixed Issues
+
+*   General
+    *   [#363](https://github.com/pmd/pmd/issues/363): \[core] Rule documentation pages are missing
+    *   [#364](https://github.com/pmd/pmd/issues/364): \[core] Stream closed exception when running through maven
+    *   [#373](https://github.com/pmd/pmd/issues/373): \[core] RuleSetFactory - add more helper methods
+
+
 ## 22-April-2017 - 5.6.0
 
 The PMD team is pleased to announce PMD 5.6.0.

src/site/markdown/overview/changelog.md

@@ -1,14 +1,22 @@
 # PMD Release Notes
 
-## 29-April-2017 - 5.6.1
+## ????? - 5.6.2-SNAPSHOT
 
-The PMD team is pleased to announce PMD 5.6.1.
+The PMD team is pleased to announce PMD 5.6.2.
 
 This is a bug fixing release.
 
+### Table Of Contents
+
+* [New and noteworthy](#New_and_noteworthy)
+* [Fixed Issues](#Fixed_Issues)
+* [API Changes](#API_Changes)
+* [External Contributions](#External_Contributions)
+
+### New and noteworthy
+
 ### Fixed Issues
 
-*   General
+### API Changes
-    *   [#363](https://github.com/pmd/pmd/issues/363): \[core] Rule documentation pages are missing
+
-    *   [#364](https://github.com/pmd/pmd/issues/364): \[core] Stream closed exception when running through maven
+### External Contributions
-    *   [#373](https://github.com/pmd/pmd/issues/373): \[core] RuleSetFactory - add more helper methods