Display selected environment in statusbar

[t-eichmann]

Once the selection of environments from #15 is implemented it would be nice to have the possibility to display the currently selected environment in the statusbar.

[gorillamoe]

Basic support for lualine is here:

require('lualine').setup({
  sections = {
    lualine_a = {},
    lualine_b = {},
    lualine_c = { "filename" },
    lualine_x = { "kulala", "encoding", "fileformat", "branch"},
    lualine_y = { "progress" },
    lualine_z = { "location" }
  },
})

[gorillamoe]

Screenshot