Update emulator version (#2025)

Author: vicancy

version.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <!-- major.minor.patch[.build] -->
     <VersionPrefix>1.26.1</VersionPrefix>
-    <VersionPrefix Condition="'$(MSBuildProjectName)' == 'Microsoft.Azure.SignalR.Emulator'">1.2.0</VersionPrefix>
+    <VersionPrefix Condition="'$(MSBuildProjectName)' == 'Microsoft.Azure.SignalR.Emulator'">1.3.0</VersionPrefix>
     <VersionPrefix Condition="'$(MSBuildProjectName)' == 'Microsoft.Azure.SignalR.Serverless.Protocols'">1.10.1</VersionPrefix>
     <!-- Alphanumberic(+hyphen) string for PackageVersion and InformationalVersion-->
     <VersionSuffix>preview1</VersionSuffix>