Updated changelog version (Azure#17406)

Updated changelog version

Author: LarryOsterman

sdk/attestation/Azure.Security.Attestation/CHANGELOG.md

@@ -1,4 +1,5 @@
 # Release History
+## 1.0.0-beta.1 (Unreleased)
+
 ## 1.0.0-alpha.1 (2020-12-08)
 Created.
-

sdk/attestation/Azure.Security.Attestation/src/Azure.Security.Attestation.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <Description>This is the project which implements the Microsoft Azure Attestation client API and package</Description>
     <AssemblyTitle>Azure SDK Template</AssemblyTitle>
-    <Version>1.0.0-alpha.1</Version>
+    <Version>1.0.0-beta.1</Version>
     <PackageTags>Azure Template</PackageTags>
     <TargetFrameworks>$(RequiredTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>