Bump for release

NEWS.rst

@@ -9,6 +9,16 @@
 
 .. towncrier release notes start
 
+20.3.1 (2020-12-03)
+===================
+
+Deprecations and Removals
+-------------------------
+
+- The --build-dir option has been restored as a no-op, to soften the transition
+  for tools that still used it. (`#9193 <https://github.com/pypa/pip/issues/9193>`_)
+
+
 20.3 (2020-11-30)
 =================
 

news/9193.removal.rst

-The --build-dir option has been restored as a no-op, to soften the transition
-for tools that still used it.

src/pip/__init__.py

@@ -4,7 +4,7 @@ if MYPY_CHECK_RUNNING:
     from typing import List, Optional
 
 
-__version__ = "21.0.dev0"
+__version__ = "20.3.1"
 
 
 def main(args=None):