Set C# version to 7.0 instead of latest to fix build issues

Updated assembly info

src/Artemis.Plugins.LayerTypes.Brush/Artemis.Plugins.LayerTypes.Brush.csproj

@@ -22,6 +22,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>

src/Artemis.Plugins.LayerTypes.Brush/Properties/AssemblyInfo.cs

@@ -7,9 +7,9 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyTitle("Artemis.Plugins.LayerTypes.Brush")]
 [assembly: AssemblyDescription("")]
 [assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("HP Inc.")]
-[assembly: AssemblyProduct("Artemis.Plugins.LayerTypes.Brush")]
-[assembly: AssemblyCopyright("Copyright © HP Inc. 2019")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Artemis")]
+[assembly: AssemblyCopyright("Copyright © Robert Beekman - 2019")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]