Bump digital twins version for 11-16-2020 release (Azure#16992)

Also add changelog notes for this release

Author: timtay-microsoft

sdk/digitaltwins/Azure.DigitalTwins.Core/CHANGELOG.md

@@ -1,13 +1,19 @@
 # Release History
 
-## 1.1.0-beta.1 (Unreleased)
+## 1.2.0 (2020-11-16)
 
 ### New Features
 
+- Added `DigitalTwinsModelFactory` to allow for the creation of certain model objects to enable mocking them for unit tests.
+
 ### Breaking changes
 
+- None
+
 ### Fixes and improvements
 
+- None
+
 ## 1.0.1 (2020-11-04)
 
 ### Fixes and improvements

sdk/digitaltwins/Azure.DigitalTwins.Core/src/Azure.DigitalTwins.Core.csproj

@@ -13,7 +13,7 @@
   <PropertyGroup>
     <PackageTags>IoT;DigitalTwins;$(PackageCommonTags)</PackageTags>
     <Description>SDK for the Azure Digital Twins service</Description>
-    <Version>1.1.0-beta.1</Version>
+    <Version>1.2.0</Version>
     <ApiCompatVersion>1.0.1</ApiCompatVersion>
   </PropertyGroup>
 
@@ -53,5 +53,4 @@
   </ItemGroup>
 
   <Import Project="$(RepoRoot)\sdk\core\Azure.Core\src\Azure.Core.props" />
-
 </Project>