Chore: 2.1.0

# [2.1.0](v2.0.1...v2.1.0) (2021-12-06)

## Update
* Added function to sign an email (rpdm/issues#50)

src/Email/Email.csproj

@@ -4,7 +4,7 @@
 		<RootNamespace>Coscine.Email</RootNamespace>
 		<AssemblyName>Coscine.Email</AssemblyName>
 		<TargetFramework>net5.0</TargetFramework>
-		<Version>2.0.1</Version>
+		<Version>2.1.0</Version>
 	</PropertyGroup>
 	<PropertyGroup>
 		<Authors>RWTH Aachen University</Authors>