Add release note

Author: justinyoo

release-notes/v2.0.0-preview1.md

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+## Release Notes ##
+
+* Including [v1.5.0](../../releases/tag/v1.5.0)
+
+
+## Breaking Changes ##
+
+* `OpenApiHttpTriggerAuthorization` has now been included to `OpenApiConfigurationOptions`.
+* `OpenApiConfigurationOptions.IncludeRequestingHostName` has now been changed to `OpenApiConfigurationOptions.ExcludeRequestingHost`.
+
+
+### Changes & Fixes ###
+
+* #526 Update OpenApiSettings
+* #477 V2/ Merge `OpenApiHttpTriggerAuthorization` with `OpenApiConfigurationOptions`
+* #397 Change `IncludeRequestingHostName` to `ExcludeRequestingHost` #393 #390