Update release instructions to mention release branch creation

Signed-off-by: Ivan Kanakarakis <ivan.kanak@gmail.com>

Author: c00kiemon5ter

release-howto.rst

@@ -20,19 +20,26 @@ When releasing a new version, the following steps should be taken:
    the long description nicely. It will treat it as plain text instead.
 
 3. Update the version in the VERSION_ file and report the changes in
-   CHANGELOG.rst_ and commit the changes.::
+   CHANGELOG.md_ and commit the changes.::
 
+    git add CHANGELOG.md
+    git add VERSION
     git commit -v -s -m "Release version X.Y.Z"
 
-4. Create a release tag_::
+4. Create a release branch_::
+
+    git branch vX.Y.Z
+
+5. Create a release tag_::
 
     git tag -a -s vX.Y.Z -m "Version X.Y.Z"
 
-5. Push these changes to Github::
+6. Push these changes to Github::
 
     git push --follow-tags origin vX.Y.Z
+    git push --follow-tags origin vX.Y.Z:vX.Y.Z
 
-6. Create a source and wheel distribution and upload it to PyPI::
+7. Create a source and wheel distribution and upload it to PyPI::
 
     # generate a source and wheel distribution at once
     python setup.py sdist bdist_wheel
@@ -46,7 +53,7 @@ When releasing a new version, the following steps should be taken:
     # then, upload release on official pypi.org
     twine upload dist/pysaml2-X.Y.Z*
 
-7. Upload the documentation to PyPI. First you need to generate the html
+8. Upload the documentation to PyPI. First you need to generate the html
    version of the documentation::
 
     cd docs/
@@ -57,7 +64,7 @@ When releasing a new version, the following steps should be taken:
 
    Submit the generated pysaml2-docs.zip file.
 
-8. Send an email to the pysaml2 list announcing this release
+9. Send an email to the pysaml2 list announcing this release
 
 
 **Important:** Once released to PyPI or any other public download location,
@@ -66,11 +73,8 @@ release ("brown bag release"). In such a case it should simply be superseded
 immediately by a new, improved release.
 
 
-This document is based on zope release-software_ guidelines.
-
-
 .. _VERSION: https://github.com/IdentityPython/pysaml2/blob/master/VERSION
-.. _CHANGELOG.rst: https://github.com/IdentityPython/pysaml2/blob/master/CHANGELOG.rst
+.. _CHANGELOG.md: https://github.com/IdentityPython/pysaml2/blob/master/CHANGELOG.md
 .. _docutils: http://docutils.sourceforge.net/
+.. _branch: https://git-scm.com/book/en/v2/Git-Branching-Branches-in-a-Nutshell
 .. _tag: https://git-scm.com/book/en/v2/Git-Basics-Tagging#_annotated_tags
-.. _release-software: https://zopetoolkit.readthedocs.io/en/latest/process/releasing-software.html