Bump version number to 0.3.1 and bump pinned botorch version (#1518)

Summary: Pull Request resolved: #1518

Reviewed By: saitcakmak

Differential Revision: D44104195

fbshipit-source-id: c0792fc8a86e1c811ffa57a615e5efefb84eae2f

Author: mpolson64

ax/__version__.py

@@ -3,4 +3,4 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-__version__: str = "0.3.0"
+__version__: str = "0.3.1"

setup.py

@@ -9,7 +9,7 @@
 from setuptools import find_packages, setup
 
 # TODO: read pinned Botorch version from a shared source
-PINNED_BOTORCH_VERSION = "0.8.2"
+PINNED_BOTORCH_VERSION = "0.8.3"
 
 if os.environ.get("ALLOW_BOTORCH_LATEST"):
     # allows a more recent previously installed version of botorch to remain