fix: net472 invalid reference (#190)

* housekeeping: Make icsharpcode non-package

* fix: net472 invalid reference

Author: glennawatson

src/Pharmacist.MsBuild.NuGet/targets/Pharmacist.MSBuild.targets

@@ -37,7 +37,7 @@
   <PropertyGroup>
     <IntermediateOutputPath Condition="$(IntermediateOutputPath) == '' Or $(IntermediateOutputPath) == '*Undefined*'">$(MSBuildProjectDirectory)\obj\$(Configuration)\</IntermediateOutputPath>
     <PharmacistTaskAssemblyFile Condition="'$(MSBuildRuntimeType)' != 'Full'">$(MSBuildThisFileDirectory)..\..\build\netstandard2.0\Pharmacist.MSBuild.dll</PharmacistTaskAssemblyFile>
-    <PharmacistTaskAssemblyFile Condition="'$(MSBuildRuntimeType)' == 'Full'">$(MSBuildThisFileDirectory)..\..\build\net472\Pharmacist.MSBuild.dll</PharmacistTaskAssemblyFile>
+    <PharmacistTaskAssemblyFile Condition="'$(MSBuildRuntimeType)' == 'Full'">$(MSBuildThisFileDirectory)..\..\build\net461\Pharmacist.MSBuild.dll</PharmacistTaskAssemblyFile>
     <PharmacistOutputFile>$(IntermediateOutputPath)\Pharmacist.NuGet.g.cs</PharmacistOutputFile>
     <PharmacistLockFile>$(IntermediateOutputPath)\Pharmacist.NuGet.g.cs.lock</PharmacistLockFile>
   </PropertyGroup>