GUACAMOLE-1604: Add 1.5.0 to list of compatible API versions.

guacamole/src/main/java/org/apache/guacamole/extension/ExtensionModule.java

@@ -67,7 +67,8 @@ public class ExtensionModule extends ServletModule {
             "1.1.0",
             "1.2.0",
             "1.3.0",
-            "1.4.0"
+            "1.4.0",
+            "1.5.0"
         ));
 
     /**