Bump requests from 2.21.0 to 2.22.0

Bumps [requests](https://github.com/requests/requests) from 2.21.0 to 2.22.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.21.0...v2.22.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -1,3 +1,3 @@
-requests==2.21.0
+requests==2.22.0
 requests-cache==0.4.13
 setuptools==40.8.0

setup.py

@@ -16,7 +16,7 @@
     author="Dave Hall",
     author_email="me@davehall.com.au",
     url="http://github.com/skwashd/python-acquia-cloud",
-    install_requires=["requests==2.21.0", "requests-cache==0.4.13"],
+    install_requires=["requests==2.22.0", "requests-cache==0.4.13"],
     license="MIT",
     classifiers=[
         "Development Status :: 4 - Beta",