fix path

Author: utkuufuk

Diff for: README.md

@@ -70,7 +70,7 @@ Learn the fundamentals of MyProduct to get a deeper understanding of our main fe
 
 Test change.
 
-{% swagger src="./openapi.yaml" path="/pet" method="post" %} POST /pet {% endswagger %}
+{% swagger src="./openapi.yml" path="/pet" method="post" %} POST /pet {% endswagger %}
 
-{% swagger src="./openapi.yaml" path="/pet" method="put" %} POST /pet {% endswagger %}
+{% swagger src="./openapi.yml" path="/pet" method="put" %} POST /pet {% endswagger %}