Bump pyyaml from 5.3.1 to 5.4 (#95)

dependabot[bot] · web-flow · commit 4f7a01f9fd78 · 2021-06-22T20:51:18.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -195,7 +195,7 @@ pytest==5.4.3
     #   pytest-watch
 pytz==2020.1
     # via google-api-core
-pyyaml==5.3.1
+pyyaml==5.4
     # via
     #   libcst
     #   pre-commit
