__future__: Add "annotations".

MicroPython ignores types anyway.

python-stdlib/__future__/__future__.py

@@ -5,3 +5,4 @@ absolute_import = True
 with_statement = True
 print_function = True
 unicode_literals = True
+annotations = True

python-stdlib/__future__/manifest.py

@@ -1,3 +1,3 @@
-metadata(version="0.0.3")
+metadata(version="0.1.0")
 
 module("__future__.py")