Merge pull request #2930 from python-pillow/add-twitter-badge

README: Add Twitter badge

README.rst

@@ -17,8 +17,8 @@ Pillow is the friendly PIL fork by `Alex Clark and Contributors <https://github.
       - | |linux| |macos| |windows| |coverage|
     * - package
       - |zenodo| |version|
-    * - chat
-      - |gitter|
+    * - social
+      - |gitter| |twitter|
 
 .. |docs| image:: https://readthedocs.org/projects/pillow/badge/?version=latest
    :target: https://pillow.readthedocs.io/?badge=latest
@@ -51,6 +51,10 @@ Pillow is the friendly PIL fork by `Alex Clark and Contributors <https://github.
    :target: https://gitter.im/python-pillow/Pillow?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
    :alt: Join the chat at https://gitter.im/python-pillow/Pillow
 
+.. |twitter| image:: https://img.shields.io/badge/tweet-on%20Twitter-00aced.svg
+   :target: https://twitter.com/PythonPillow
+   :alt: Follow on https://twitter.com/PythonPillow
+
 .. end-badges