Merge pull request #21 from silenceshell/dependabot/pip/pyyaml-5.3

Bump pyyaml from 5.1 to 5.3

Author: silenceshell

requirements.txt

@@ -25,7 +25,7 @@ pygobject==3.26.1
 pykerberos==1.1.14
 pyOpenSSL==17.5.0
 pyxdg==0.26
-PyYAML==5.1
+PyYAML==5.3
 requests==2.20.4
 SecretStorage==2.3.1
 simplejson==3.13.2