Bump pyjwt from 1.6.4 to 1.7.1

Bumps [pyjwt](https://github.com/jpadilla/pyjwt) from 1.6.4 to 1.7.1.
- [Release notes](https://github.com/jpadilla/pyjwt/releases)
- [Changelog](https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.md)
- [Commits](jpadilla/pyjwt@1.6.4...1.7.1)

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

Author: dependabot-support

requirements.txt

@@ -6,7 +6,7 @@ idna==2.7
 more-itertools==4.3.0
 pluggy==0.8.0
 py==1.7.0
-PyJWT==1.6.4
+PyJWT==1.7.1
 pytest==3.9.3
 requests==2.20.0
 six==1.11.0