version number bump to next patch (#2920)

.appveyor.yml

-version: 2.3.18-branch-{branch}-build-{build}
+version: 2.4.1-branch-{branch}-build-{build}
 
 # Skipping commits affecting specific files (GitHub only). More details here: https://www.appveyor.com/docs/appveyor-yml
 skip_commits:

CMakeLists.txt

@@ -22,7 +22,7 @@ ENDIF()
 
 # A project name is needed for CPack
 # Version can be overriden by git tags, see cmake/getversion.cmake
-PROJECT("Cockatrice" VERSION 2.3.18)
+PROJECT("Cockatrice" VERSION 2.4.1)
 
 # Use c++11 for all targets
 set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ ISO Standard")