Add release notes for version 0.17.67

Documented the update to the swift5 template, which now supports exploded GET parameters for Swift. This provides users with information about the latest changes in the project.

Author: mirkokg

README.md

@@ -16,6 +16,8 @@ It currently consists of
 # Release Notes
 BOAT is still under development and subject to change.
 
+## 0.17.67
+Update swift5 template to add support for exploded GET parameters (Swift only).
 ## 0.17.66
 * Add support params of openapi-generator `name-mappings` and `enum-name-mappings`.
 Check `Property & Enum Name Mappings (new)` in [boat-maven-plugin](boat-maven-plugin/README.md)