Try to fix travis build to adopt to our new versioning Scheme.

build.gradle

@@ -26,11 +26,11 @@ repositories {
 }
 
 if (System.getenv('TRAVIS') != null) {
-    /*if (System.env.TRAVIS_TAG != "") {
-        ext.jmeEngineVersion = "3.1.0-" + System.env.TRAVIS_TAG + "-SNAPSHOT"
-    } else {*/
+    if (System.env.TRAVIS_TAG != "") {
+        ext.jmeEngineVersion = "3.2.0-" + System.env.TRAVIS_TAG + "-SNAPSHOT"
+    } else {
         ext.jmeEngineVersion = "3.2.0-SNAPSHOT" // Use Beta 2 instead of 3.1.0-master-SNAPSHOT
-    //}
+    }
 } else {
     ext.jmeEngineVersion = "3.2.0-SNAPSHOT" // In case you build of the HEAD of 3.1, you need to change that to 3.1.0-SNAPSHOT again
 }