Update glom/cli.py

Author: mahmoud

glom/cli.py

@@ -11,7 +11,7 @@
   --help / -h                 show this help message and exit
   --target-file TARGET_FILE   path to target data source (optional)
   --target-format TARGET_FORMAT
-                              format of the source data (json, python, toml
+                              format of the source data (json, python, toml,
                               or yaml) (defaults to 'json')
   --spec-file SPEC_FILE       path to glom spec definition (optional)
   --spec-format SPEC_FORMAT   format of the glom spec definition (json, python,