Update Copyright

Author: david-schrenker

src/SocketLabs/SocketLabs.csproj

@@ -9,7 +9,7 @@
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <Version>1.1.0.0</Version>
-    <Copyright>(C) 2018-2019 SocketLabs</Copyright>
+    <Copyright>(C) 2018-2020 SocketLabs</Copyright>
     <PackageIconUrl>https://www.socketlabs.com/assets/socketlabs-logo1.png</PackageIconUrl>
     <Authors>SocketLabs Development Team</Authors>
     <Product>SocketLabs .Net Client Library</Product>