utils.py: consistent quote usage

gwkoji/utils.py

@@ -77,13 +77,13 @@ def source_type(source):
     """
     source = pathlib.Path(source)
     name = source.name
-    if name.endswith(".src.rpm"):
+    if name.endswith('.src.rpm'):
         return 'srcrpm'
-    if name.endswith(".spec"):
+    if name.endswith('.spec'):
         return 'spec'
-    if name.endswith(".tar") or source.stem.endswith(".tar"):
+    if name.endswith('.tar') or source.stem.endswith('.tar'):
         return 'tarball'
-    if str(source).startswith(("git+https", "git+ssh")):
+    if str(source).startswith(('git+https', 'git+ssh')):
         return 'git'
     raise ValueError(
         "failed to determine source type for '{0}'".format(source),