bump version to 6.4.4 and update release-notes.md

Author: stephengold

HeartLibrary/release-notes.md

@@ -1,5 +1,12 @@
 # release log for the Heart Library and related tests
 
+## Version 6.4.4 released on TBD
+
+ + Targeted jMonkeyEngine version 3.4.0-stable.
+ + Replaced HeartTextures with textures from the Georg project.
+ + Anti-aliased the "shapes" textures by downsampling them 10x.
+ + Upgraded Gradle to v7.0.2
+
 ## Version 6.4.3+for34 released on 22 April 2021
 
  + Bugfix: Locale not specified in the `MyString.describe()`

HeartLibrary/src/main/java/jme3utilities/Heart.java

@@ -408,7 +408,7 @@ public static void setLoggingLevels(Level newLevel) {
      * @return project name, library name, branch, and revision
      */
     public static String version() {
-        return "Heart Heart master $Rev: 6.4.4+for34-SNAPSHOT $";
+        return "Heart Heart master $Rev: 6.4.4 $";
     }
 
     /**

common.gradle

@@ -30,7 +30,7 @@ gradle.projectsEvaluated {
 
 ext {
     // current versions of various libraries
-    heartVersion = '6.4.4+for34-SNAPSHOT'
+    heartVersion = '6.4.4'
     jmonkeyengineVersion = '3.4.0-stable'
 }