Merge pull request #6 from decentralised-dataexchange/dependabot/pip/pyyaml-5.4

Bump pyyaml from 5.3.1 to 5.4

Author: georgepadayatti

requirements.txt

@@ -49,7 +49,7 @@ PyNaCl==1.3.0
 python-dateutil==2.8.1
 python3-indy==1.16.0
 pytz==2021.1
-PyYAML==5.3.1
+PyYAML==5.4
 qrcode==6.1
 requests==2.23.0
 six==1.16.0