Update to 6.4.0 + small fixes

Author: tijsrademakers

distro/build.xml

@@ -4,7 +4,7 @@
 
 	<property file="${user.home}/.flowable/build.properties" />
 
-	<property name="flowable.version" value="6.4.0-SNAPSHOT" />
+	<property name="flowable.version" value="6.4.0" />
 	<property name="target.distro.root" value="target/zip/flowable-${flowable.version}" />
 	<property name="flowable.website" value="../../flowable-website" />
 

distro/src/readme.html

@@ -39,6 +39,9 @@ <h4>Highlights</h4>
     When you reference a variable in an expression like ${customerNumber > 40} and there is no customerNumber variable yet, an exception would be thrown.
     With the variable expression support this can be handled without an exception with ${variables:getOrDefault(customerNumber, 0) > 0}. 
     A similar expression is possible for strings with ${variables:get(customerName) == "test"}. The user guide describes the full set of available variable expressions.</li>
+    <li>A first version with support for MongoDB persistence has been added. The MongoDB module is available from a separate Git repository at <a href="https://github.com/flowable/flowable-mongodb">https://github.com/flowable/flowable-mongodb</a>.
+    The MongoDB module is made available in a separate repository, so that it can be released in a different pace than the full Flowable Engine releases.
+    The support of MongoDB already includes most BPMN constructs, but in the coming releases it will be extended to be on par with the relational database support.</li>
     <li>Upgrade to Spring 5.x for all the integration modules using Spring.</li>
     <li>Added plan item lifecycle listener to the CMMN engine, to allow for listening to plan item instance state changes</li>
     <li>In the Task app support for activating manual plan items and triggering user event listeners has been added</li>

docs/public-api/tools/flowable-oas-generator/pom.xml

@@ -9,7 +9,7 @@
         <groupId>org.flowable</groupId>
         <artifactId>flowable-root</artifactId>
         <relativePath>../../../../</relativePath>
-        <version>6.4.0-SNAPSHOT</version>
+        <version>6.4.0</version>
     </parent>
 
     <properties>

docs/public-api/tools/flowable-rest-asciidoc/pom.xml

@@ -10,7 +10,7 @@
         <groupId>org.flowable</groupId>
         <artifactId>flowable-root</artifactId>
         <relativePath>../../../../</relativePath>
-        <version>6.4.0-SNAPSHOT</version>
+        <version>6.4.0</version>
     </parent>
 
 

docs/public-api/tools/flowable-swagger-ui/pom.xml

@@ -10,7 +10,7 @@
     <groupId>org.flowable</groupId>
     <artifactId>flowable-root</artifactId>
     <relativePath>../../../../</relativePath>
-    <version>6.4.0-SNAPSHOT</version>
+    <version>6.4.0</version>
   </parent>
 
   <properties>