Add release note

release-notes/v1.2.0.md

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+## Release Notes ##
+
+Bug fixes and enhancements
+
+
+### Changes & Fixes ###
+
+* #362 Do not consider abstract classes in configuration options
+* #368 Update logic for isolated worker #365
+* #367 multipart/form-data in OpenAPI v2 Rendering Workaround (Interim) #365
+* #364 Fix RecursiveObjectTypeVisitor to filter duplicated field names #356
+* #361 Add method to load types from referenced function app #351 #132