Bump version to 3.2.1

Author: roji

src/EntityFramework6.Npgsql/EntityFramework6.Npgsql.csproj

@@ -5,7 +5,7 @@
     <Copyright>Copyright 2019 © The Npgsql Development Team</Copyright>
     <Company>Npgsql</Company>
     <PackageTags>npgsql postgresql postgres data database entity framework ef orm</PackageTags>
-    <VersionPrefix>3.2.0</VersionPrefix>
+    <VersionPrefix>3.2.1</VersionPrefix>
     <LangVersion>latest</LangVersion>
     <TargetFramework>net45</TargetFramework>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>