Set LangVersion and annotate #nullable to avoid build errors and warnings (#3)

Author: PetrHeinz

BetterStack.Logs.Serilog.csproj

@@ -15,6 +15,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
+    <LangVersion>8.0</LangVersion>
     <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
     <DefaultItemExcludes>$(DefaultItemExcludes);example-project/**;dashboard.png</DefaultItemExcludes>
   </PropertyGroup>

BetterStack.Logs.Serilog/BetterStackHttpClient.cs

@@ -40,7 +40,7 @@ public virtual void Configure(IConfiguration configuration)
         /// <inheritdoc />
         public virtual async Task<HttpResponseMessage> PostAsync(string requestUri, Stream contentStream)
         {
-            using var content = new StreamContent(contentStream);
+            var content = new StreamContent(contentStream);
             content.Headers.Add("Content-Type", "application/json");
 
             var response = await httpClient

BetterStack.Logs.Serilog/LoggerSinkConfigurationExtensions.cs

@@ -1,3 +1,5 @@
+#nullable enable
+
 using BetterStack.Logs.Serilog;
 using Serilog.Configuration;
 using Serilog.Core;