Fix typo

src/Discord.Net.Rest/Discord.Net.Rest.csproj

@@ -5,7 +5,7 @@
     <RootNamespace>Discord.Rest</RootNamespace>
     <Description>A core Discord.Net library containing the REST client and models.</Description>
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net45;netstandard1.1;netstandard1.3;netstandard2.0</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.1;netstandard1.3netstandard2.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.1;netstandard1.3;netstandard2.0</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\Discord.Net.Core\Discord.Net.Core.csproj" />