Add release note

Author: justinyoo

release-notes/v1.3.0.md

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+## Release Notes ##
+
+Bug fixes and enhancements
+
+
+### Changes & Fixes ###
+
+* #395 Update GetTypesFromReferencedFunctionApps #387 #377
+* #392 Update properties to be virtual on DefaultOpenApiConfigurationOptions #391
+* #388 Lenght => Length
+* #383 Funktion key from config gets overwritten by function key in url #382
+* #381 Ignore failure during assembly loading #377 #373
+* #344 Allow IDocument to be modified before rendering #376 #340