Bump pyyaml from 3.13 to 5.1

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 3.13 to 5.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@3.13...5.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ pycparser==2.19
 pycryptodome==3.7.2
 PyJWT==1.7.1
 python-dateutil==2.7.5
-PyYAML==3.13
+PyYAML==5.1
 requests==2.21.0
 websocket-client==0.54.0
 websockets

setup.py

@@ -35,7 +35,7 @@
         "pycryptodome==3.7.2",
         "PyJWT==1.7.1",
         "python-dateutil==2.7.5",
-        "PyYAML==3.13",
+        "PyYAML==5.1",
         "requests==2.21.0",
         "websocket-client==0.54.0",
         "websockets",