Updated request body on secret creation

This allows the java client to properly set a secret in
the generated client. Currently it is unable to properly
handle the `format: binary` type for strings.

CHANGELOG.md

@@ -5,6 +5,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Request body details for secret creation so all clients can properly set secrets. This changes
+  the MIME type of the request body to `application/octet-stream` in place of text plain,
+  allowing for proper binary secrets in clients (`format: binary` is broken in some clients).
+  [cyberark/conjur-openapi-spec#187](https://github.com/cyberark/conjur-openapi-spec/pull/187)
 
 ## [5.1.1] - 2021-04-28
 ### Added

spec/secrets.yml

@@ -83,10 +83,9 @@ components:
           description: "Secret data"
           required: false
           content:
-            text/plain:
+            application/octet-stream:
               schema:
                 type: string
-                format: binary
 
         responses:
           "201":