Update the version suffix to beta2

Author: tannergooding

Directory.Build.props

@@ -46,7 +46,7 @@
     <Product>LLVMSharp</Product>
     <RootNamespace>LLVMSharp</RootNamespace>
     <VersionPrefix>15.0.0</VersionPrefix>
-    <VersionSuffix Condition="'$(EXCLUDE_SUFFIX_FROM_VERSION)' != 'true'">beta1</VersionSuffix>
+    <VersionSuffix Condition="'$(EXCLUDE_SUFFIX_FROM_VERSION)' != 'true'">beta2</VersionSuffix>
     <VersionSuffix Condition="'$(GITHUB_EVENT_NAME)' == 'pull_request'">pr</VersionSuffix>
   </PropertyGroup>