Improve initiating manifest parser from a package archive

platformio/package/manifest/parser.py

@@ -119,9 +119,10 @@ class ManifestParserFactory(object):
         assert path.endswith("tar.gz")
         with tarfile.open(path, mode="r:gz") as tf:
             for t in sorted(ManifestFileType.items().values()):
+                for member in (t, "./" + t):
                     try:
                         return ManifestParserFactory.new(
-                        tf.extractfile(t).read().decode(), t
+                            tf.extractfile(member).read().decode(), t
                         )
                     except KeyError:
                         pass