Update the copyright information in the csproj file

Author: gus33000

Windows Build Identifier/Windows Build Identifier.csproj

@@ -6,7 +6,7 @@
     <RootNamespace>WindowsBuildIdentifier</RootNamespace>
     <StartupObject>WindowsBuildIdentifier.Program</StartupObject>
     <AssemblyVersion>1.0.0.0</AssemblyVersion>
-    <Copyright>Gustave Monce © 2009-2020</Copyright>
+    <Copyright>Gustave Monce © 2018-2021</Copyright>
     <Description>Identifies Windows builds from various media sources and formats</Description>
     <Platforms>AnyCPU;ARM32;ARM64;x64;x86</Platforms>
   </PropertyGroup>