[BUG] hide_numbers in setup is no longer valid

Since neovim 0.11, [number is disabled by default in terminal](https://neovim.io/doc/user/terminal.html#terminal-config). So if users want to enable it, they should set it by themselves.

```vim
au TermOpen * setlocal number
au TermOpen * setlocal relativenumber
```

As a consequence, `hide_numbers` would no longer useful or valid. So I have the following patch.

```diff
diff --git a/README.md b/README.md
index 54733f3..67c2fb3 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,6 @@ require("toggleterm").setup{
on_stdout = fun(t: Terminal, job: number, data: string[], name: string) -- callback for processing output on stdout
on_stderr = fun(t: Terminal, job: number, data: string[], name: string) -- callback for processing output on stderr
on_exit = fun(t: Terminal, job: number, exit_code: number, name: string) -- function to run when terminal process exits
- hide_numbers = true, -- hide the number column in toggleterm buffers
shade_filetypes = {},
autochdir = false, -- when neovim changes it current directory the terminal will change it's own when next it's opened
highlights = {
diff --git a/lua/toggleterm/config.lua b/lua/toggleterm/config.lua
index 736d8cf..a696891 100644
--- a/lua/toggleterm/config.lua
+++ b/lua/toggleterm/config.lua
@@ -20,7 +20,6 @@ local function shade(color, factor) return colors.shade_color(color, factor) end
--- @class ToggleTermConfig
--- @field size number
--- @field shade_filetypes string[]
---- @field hide_numbers boolean
--- @field open_mapping string | string[]
--- @field shade_terminals boolean
--- @field insert_mappings boolean
@@ -46,7 +45,6 @@ local function shade(color, factor) return colors.shade_color(color, factor) end
local config = {
size = 12,
shade_filetypes = {},
- hide_numbers = true,
shade_terminals = true,
insert_mappings = true,
terminal_mappings = true,
diff --git a/lua/toggleterm/terminal.lua b/lua/toggleterm/terminal.lua
index 19231c4..0dcffc5 100644
--- a/lua/toggleterm/terminal.lua
+++ b/lua/toggleterm/terminal.lua
@@ -437,11 +437,6 @@ function Terminal:__set_win_options()
local field = self.direction == "vertical" and "winfixwidth" or "winfixheight"
utils.wo_setlocal(self.window, field, true)
end
-
- if config.hide_numbers then
- utils.wo_setlocal(self.window, "number", false)
- utils.wo_setlocal(self.window, "relativenumber", false)
- end
end

---@package
```

Because I see the requirement is neovim 0.7. So I don't send the PR. Just let the author to decide it.