readme: add packing badge

Follows #198

Author: DifferentialOrange

README.rst

@@ -1,6 +1,11 @@
 Python driver for Tarantool
 ===========================
 
+.. image:: https://github.com/tarantool/tarantool-python/actions/workflows/testing.yml/badge.svg?branch=master
+    :target: https://github.com/tarantool/tarantool-python/actions/workflows/testing.yml
+.. image:: https://github.com/tarantool/tarantool-python/actions/workflows/packing.yml/badge.svg?branch=master
+    :target: https://github.com/tarantool/tarantool-python/actions/workflows/packing.yml
+
 This package is a pure-python client library for `Tarantool`_.
 
 `Documentation`_  |  `Downloads`_  |  `PyPI`_  |  `GitHub`_  | `Issue tracker`_
@@ -11,9 +16,6 @@ This package is a pure-python client library for `Tarantool`_.
 .. _`GitHub`: https://github.com/tarantool/tarantool-python
 .. _`Issue tracker`: https://github.com/tarantool/tarantool-python/issues
 
-.. image:: https://github.com/tarantool/tarantool-python/actions/workflows/testing.yml/badge.svg?branch=master
-    :target: https://github.com/tarantool/tarantool-python/actions/workflows/testing.yml
-
 Download and install
 --------------------