Update version to 0.3.3

Author: Dekker1

CHANGELOG.rst

@@ -9,6 +9,9 @@ this project adheres to `Semantic Versioning <https://semver.org/>`_.
 Unreleased_
 ------------
 
+0.3.3_ - 2020-08-17
+-------------------
+
 Added
 ^^^^^
 - Add ``requiredFlags`` field to the ``Solver`` data class.
@@ -171,6 +174,8 @@ release is best described in the `documentation
 <https://minizinc-python.readthedocs.io/en/0.1.0/>`_.
 
 
+..  _0.3.3: https://gitlab.com/minizinc/minizinc-python/compare/0.3.2...0.3.3
+..  _0.3.2: https://gitlab.com/minizinc/minizinc-python/compare/0.3.1...0.3.2
 ..  _0.3.1: https://gitlab.com/minizinc/minizinc-python/compare/0.3.0...0.3.1
 ..  _0.3.0: https://gitlab.com/minizinc/minizinc-python/compare/0.2.3...0.3.0
 ..  _0.2.3: https://gitlab.com/minizinc/minizinc-python/compare/0.2.2...0.2.3