Chore: 2.8.0

# [2.8.0](v2.7.0...v2.8.0) (2022-06-07)

## Fix
* Metadata can be retrieved without a file present
* Metadata can be retrieved without a file present (coscine/issues#2122)

## Update
* Extend with a Mimetype attribute
* Extend with a Mimetype attribute

src/Tree/Tree.csproj

@@ -5,7 +5,7 @@
 		<AssemblyName>Coscine.Api.Tree</AssemblyName>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
 		<TargetFramework>net6.0</TargetFramework>
-		<Version>2.7.0</Version>
+		<Version>2.8.0</Version>
 	</PropertyGroup>
 	<PropertyGroup>
 		<Authors>RWTH Aachen University</Authors>