Version bump prior to release

Author: fraschetti

setup.py

@@ -14,7 +14,7 @@
 plugin_name = "Octoslack"
 
 # The plugin's version. Can be overwritten within OctoPrint's internal data via __plugin_version__ in the plugin module
-plugin_version = "1.5.0"
+plugin_version = "1.6.0"
 
 # The plugin's description. Can be overwritten within OctoPrint's internal data via __plugin_description__ in the plugin
 # module