nvim_buf_set_extmark bug.

[LinuxIsCool]

When using :AI from visual mode:

Error executing Lua callback: .../ygg/.local/share/nvim/lazy/ai.vim/lua/_ai/indicator.lua:41: Invalid 'end_col': out of range
stack traceback:
        [C]: in function 'nvim_buf_set_extmark'
        .../ygg/.local/share/nvim/lazy/ai.vim/lua/_ai/indicator.lua:41: in function 'create'
        ...e/ygg/.local/share/nvim/lazy/ai.vim/lua/_ai/commands.lua:52: in function 'ai'
        /home/ygg/.local/share/nvim/lazy/ai.vim/plugin/ai.lua:2: in function </home/ygg/.local/share/nvim/lazy/ai.vim/plugin/ai.lua:1>
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