Chore: 1.4.0

# [1.4.0](v1.3.0...v1.4.0) (2021-01-29)

## Update
* Support for .NET 5.0 added. Current Target Frameworks are .NET Framework 4.6.1 and .NET 5.0. (coscine/issues#1226)

.config/dotnet-tools.json

+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "gitversion.tool": {
+      "version": "5.6.4",
+      "commands": [
+        "dotnet-gitversion"
+      ]
+    },
+    "dotnet-version-cli": {
+      "version": "2.1.1",
+      "commands": [
+        "dotnet-version"
+      ]
+    }
+  }
+}
\ No newline at end of file

src/ProxyApi/ProxyApi.csproj

-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<OutputType>Library</OutputType>
 		<RootNamespace>Coscine.ProxyApi</RootNamespace>
 		<AssemblyName>Coscine.ProxyApi</AssemblyName>
 		<TargetFrameworks>net5.0;net461</TargetFrameworks>
-	</PropertyGroup>
+	<Version>1.4.0</Version></PropertyGroup>
 	<ItemGroup>
 		<PackageReference Include="Consul" Version="1.6.1.1" />
 		<PackageReference Include="Coscine.Configuration" Version="*-*" />