cleaning up

meson.build

@@ -11,6 +11,8 @@ res = gnome.compile_resources(
 )
 
 deps = dependency(['gtkmm-4.0', 'sigc++-3.0'])
-src = ['src/window.cpp', 'src/window.hpp', 'src/minefield.hpp', 'src/minefield.cpp', res]
+src = ['src/window.cpp', 'src/window.hpp', 'src/minefield.hpp', 'src/minefield.cpp',
+       'src/timer.hpp', 'src/timer.cpp', res]
+       
 exe = executable('minesweeper', src, dependencies : deps, install : true)