Prepare pmd release 6.31.0

docs/_config.yml

@@ -1,9 +1,9 @@
 repository: pmd/pmd
 
 pmd:
-    version: 6.31.0-SNAPSHOT
+    version: 6.31.0
     previous_version: 6.30.0
-    date: ??-January-2021
+    date: 30-January-2021
     release_type: minor
 
 # release types: major, minor, bugfix

docs/pages/next_major_development.md

@@ -125,6 +125,22 @@ the breaking API changes will be performed in 7.0.0.
 an API is tagged as `@Deprecated` or not in the latest minor release. During the development of 7.0.0,
 we may decide to remove some APIs that were not tagged as deprecated, though we'll try to avoid it." %}
 
+#### 6.31.0
+
+##### Deprecated API
+
+*   {% jdoc xml::lang.xml.rule.AbstractDomXmlRule %}
+*   {% jdoc xml::lang.wsdl.rule.AbstractWsdlRule %}
+*   A few methods of {% jdoc xml::lang.xml.rule.AbstractXmlRule %}
+
+##### Experimental APIs
+
+*   The method {% jdoc !!core::lang.ast.GenericToken#getKind() %} has been added as experimental. This
+    unifies the token interface for both JavaCC and Antlr. The already existing method
+    {% jdoc !!core::cpd.token.AntlrToken#getKind() %} is therefore experimental as well. The
+    returned constant depends on the actual language and might change whenever the grammar
+    of the language is changed.
+
 #### 6.30.0
 
 ##### Deprecated API

docs/pages/release_notes.md

@@ -104,5 +104,10 @@ An example report can be found in the documentation in [Report formats for PMD](
 *   [#3073](https://github.com/pmd/pmd/pull/3073): \[core] Include SARIF renderer - [Manuel Moya Ferrer](https://github.com/mmoyaferrer)
 *   [#3084](https://github.com/pmd/pmd/pull/3084): \[vf] VfUnescapeEl false-positive with builtin functions - [Josh Feingold](https://github.com/jfeingold35)
 
+### Stats
+* 116 commits
+* 40 closed tickets & PRs
+* Days since last release: 49
+
 {% endtocmaker %}