Add help hint when bad commands are entered

Boyan-MILANOV · Boyan-MILANOV · commit 913b4e1f938e · 2020-02-09T11:15:43.000+01:00
diff --git a/cli-tool/ropium b/cli-tool/ropium
@@ -128,7 +128,7 @@ def main():
                 except ContextException as e:
                     error(str(e), skip=True)
             else:
-                error(f"Unknown command '{command}'", skip=True)
+                error(f"Unknown command '{command}' (type 'help' for help)", skip=True)
             print('')
         except KeyboardInterrupt:
             pass
