feat: Support reading config from .yamllint.yml and .yamllint.yaml

Signed-off-by: Ibrahim AshShohail <me@ibrasho.com>

docs/configuration.rst

@@ -14,7 +14,8 @@ To use a custom configuration file, use the ``-c`` option:
 If ``-c`` is not provided, yamllint will look for a configuration file in the
 following locations (by order of preference):
 
-- ``.yamllint`` in the current working directory
+- ``.yamllint``, ``.yamllint.yaml`` or ``.yamllint.yml`` in the current working
+  directory
 - ``$XDG_CONFIG_HOME/yamllint/config``
 - ``~/.config/yamllint/config``
 

yamllint/cli.py

@@ -154,6 +154,10 @@ def run(argv=None):
             conf = YamlLintConfig(file=args.config_file)
         elif os.path.isfile('.yamllint'):
             conf = YamlLintConfig(file='.yamllint')
+        elif os.path.isfile('.yamllint.yaml'):
+            conf = YamlLintConfig(file='.yamllint.yaml')
+        elif os.path.isfile('.yamllint.yml'):
+            conf = YamlLintConfig(file='.yamllint.yml')
         elif os.path.isfile(user_global_config):
             conf = YamlLintConfig(file=user_global_config)
         else: