<langversion>latest</langversion> on all projects

Author: Mpdreamz

src/Directory.build.props

@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>latest</LangVersion>
 	</PropertyGroup>
 </Project>

src/Library.build.props

@@ -24,5 +24,7 @@
 		<PackageLicenseUrl>https://github.com/elastic/elasticsearch-net/blob/master/license.txt</PackageLicenseUrl>
 		<ReleaseNotes>See https://github.com/elastic/elasticsearch-net/releases</ReleaseNotes>
 		<PackageIconUrl>https://raw.githubusercontent.com/elastic/elasticsearch-net/master/build/nuget-icon.png</PackageIconUrl>
+    
+    <LangVersion>latest</LangVersion>
 	</PropertyGroup>
 </Project>

src/PublishArtifacts.build.props

@@ -14,6 +14,7 @@
     <Prefer32Bit>false</Prefer32Bit>
     <DebugSymbols>true</DebugSymbols>
     <DebugType>portable</DebugType>
+    <LangVersion>latest</LangVersion>
 
     <DoSourceLink></DoSourceLink>
     <SourceLink Condition="'$(DoSourceLink)'!=''">$(BaseIntermediateOutputPath)\sl-$(MsBuildProjectName)-$(TargetFramework).json</SourceLink>