Updated plugin description (copyright)

Author: Ayuto

src/core/sp_main.cpp

@@ -430,7 +430,7 @@ void CSourcePython::UnPause( void )
 //-----------------------------------------------------------------------------
 const char *CSourcePython::GetPluginDescription( void )
 {
-	return "Source.Python, (C) 2012-2016, Source.Python Team.";
+	return "Source.Python, (C) 2012-2018, Source.Python Team.";
 }
 
 //-----------------------------------------------------------------------------