[welcomeq] Update comments

- Copyright years
 - Purpose of this module

src/modules/welcomeq/CMakeLists.txt

@@ -1,3 +1,6 @@
+# This is a re-write of the welcome module using QML view steps
+# instead of widgets.
+
 set( _welcome ${CMAKE_CURRENT_SOURCE_DIR}/../welcome )
 
 include_directories( ${PROJECT_BINARY_DIR}/src/libcalamaresui ${_welcome} )

src/modules/welcomeq/Config.cpp

@@ -1,6 +1,6 @@
 /* === This file is part of Calamares - <https://github.com/calamares> ===
  *
- *   Copyright 2019, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2019-2020, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by

src/modules/welcomeq/Config.h

@@ -1,6 +1,6 @@
 /* === This file is part of Calamares - <https://github.com/calamares> ===
  *
- *   Copyright 2019, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2019-2020, Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by

src/modules/welcomeq/WelcomeQmlViewStep.cpp

@@ -1,7 +1,7 @@
 /* === This file is part of Calamares - <https://github.com/calamares> ===
  *
  *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
- *   Copyright 2018, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2018,2020 Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by

src/modules/welcomeq/WelcomeQmlViewStep.h

@@ -1,6 +1,6 @@
 /* === This file is part of Calamares - <https://github.com/calamares> ===
  *
- *   Copyright 20195, Adriaan de Groot <groot@kde.org>
+ *   Copyright 2019-2020 Adriaan de Groot <groot@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by