Update URLs to use https instead of http (#132)

Suggested-by: check-all-the-things

Co-authored-by: Michael Howitz <mh@gocept.com>

Author: pabs3

CONTRIBUTING.rst

@@ -30,7 +30,7 @@ Preparing Pull Requests
 #. Install `tox <https://tox.readthedocs.io/en/latest/>`_::
 
    Tox is used to run all the tests and will automatically setup virtualenvs
-   to run the tests in. Implicitly http://www.virtualenv.org/en/latest/ is used::
+   to run the tests in. Implicitly https://virtualenv.pypa.io/ is used::
 
     $ pip install tox
     $ tox -e linting,py37

LICENSE

@@ -1,3 +1,3 @@
 This Source Code Form is subject to the terms of the Mozilla Public
 License, v. 2.0. If a copy of the MPL was not distributed with this
-file, You can obtain one at http://mozilla.org/MPL/2.0/.
+file, You can obtain one at https://www.mozilla.org/MPL/2.0/.

README.rst

@@ -1,7 +1,7 @@
 pytest-rerunfailures
 ====================
 
-pytest-rerunfailures is a plugin for `pytest <http://pytest.org>`_ that
+pytest-rerunfailures is a plugin for `pytest <https://pytest.org>`_ that
 re-runs tests to eliminate intermittent failures.
 
 .. image:: https://img.shields.io/badge/license-MPL%202.0-blue.svg
@@ -135,8 +135,8 @@ Compatibility
 Resources
 ---------
 
-- `Issue Tracker <http://github.com/pytest-dev/pytest-rerunfailures/issues>`_
-- `Code <http://github.com/pytest-dev/pytest-rerunfailures/>`_
+- `Issue Tracker <https://github.com/pytest-dev/pytest-rerunfailures/issues>`_
+- `Code <https://github.com/pytest-dev/pytest-rerunfailures/>`_
 
 Development
 -----------