Merge pull request #49 from alexott/help-short-option

Add the short option for help command: `-h`

Author: thomaspatzke

Diff for: sigma/cli/main.py

@@ -37,7 +37,12 @@
 from .pysigma import check_pysigma_command
 
 
-@click.group()
+CONTEXT_SETTINGS={
+    "help_option_names": ['-h', '--help']
+}
+
+
+@click.group(context_settings=CONTEXT_SETTINGS)
 def cli():
     pass