Bump version to 1.6

Author: mphe

demo/addons/ropesim/plugin.cfg

@@ -3,5 +3,5 @@
 name="GDNative Ropesim"
 description="Fast verlet integration based rope simulation for Godot."
 author="Marvin Ewald"
-version="1.5"
+version="1.6"
 script="plugin.gd"