update package version to 0.2.1

Author: itn3000

PooledStream/PooledStream.csproj

@@ -4,7 +4,7 @@
     <TargetFrameworks>netstandard2.1;netstandard1.1</TargetFrameworks>
     <!-- <TargetFramework>netstandard2.1</TargetFramework> -->
     <PackageId>PooledStream</PackageId>
-    <PackageVersion>0.2.0</PackageVersion>
+    <PackageVersion>0.2.1</PackageVersion>
     <Authors>itn3000</Authors>
     <Description>Efficient MemoryStream powered by System.Buffers.ArrayPool</Description>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>