fix: Add packaging dependency for twine < 4.0 (#522)

* chore: Adds pyhton36 deprecation to changelog

* fix: updates compatability test to 3.7

* fix: pin tox dependency < 4.0

* fix: reword the deprecation announcement

* chore: Update SUPPORT_POLICY.rst

* fix: Add Maintenance Date in SUPPORT_POLICY.rst

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

* fix: SUPPORT_POLICY.rst

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

* fix: Add packaging dependency for twine

Co-authored-by: Shubham Chaturvedi <scchatur@amazon.com>
Co-authored-by: Shubham Chaturvedi <shubhamchaturvedi7@gmail.com>
Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

Author: 4 people

dev_requirements/release-requirements.txt

@@ -2,3 +2,5 @@ pypi-parker==0.1.2
 setuptools==60.7.1
 twine==3.8.0
 wheel==0.37.1
+#This is required for twine < 4.0
+packaging