Update version in api yaml

Author: gjong

docs/openapi.yml

@@ -1,4 +1,4 @@
-openapi: 4.2.0
+openapi: 3.1.0
 info:
   title: Pledger
   description: Pledger.io is a self-hosted personal finance application that helps
@@ -9,7 +9,7 @@ info:
   license:
     name: MIT
     url: https://opensource.org/licenses/MIT
-  version: 2.0.0
+  version: 4.2.0
 security:
   - bearer: []
 tags: