docs: add heirline integration to README (#114)

Author: gbroques

README.md

@@ -175,6 +175,11 @@ return require('packer').startup(function(use)
     config = ...,
   }
 
+  -- integrate with heirline
+  use {
+    'rebelot/heirline.nvim',
+    config = ...,
+  }
 end)
 ```
 
@@ -202,6 +207,14 @@ require("lazy").setup({
     config = ...
   },
 
+  -- integrate with heirline
+  {
+    'rebelot/heirline.nvim',
+    dependencies = {
+      'linrongbin16/lsp-progress.nvim',
+    },
+    config = ...
+  }
 })
 ```
 
@@ -217,6 +230,9 @@ Plug 'linrongbin16/lsp-progress.nvim'
 " integrate with lualine
 Plug 'nvim-lualine/lualine.nvim'
 
+" integrate with heirline
+Plug 'rebelot/heirline.nvim'
+
 call plug#end()
 
 lua require('lsp-progress').setup()
@@ -241,6 +257,8 @@ lua require('lsp-progress').setup()
 
 ### Statusline Integration
 
+#### [lualine](https://github.com/nvim-lualine/lualine.nvim)
+
 ```lua
 require("lualine").setup({
   sections = {
@@ -263,6 +281,32 @@ vim.api.nvim_create_autocmd("User", {
 })
 ```
 
+#### [heirline](https://github.com/rebelot/heirline.nvim)
+
+```lua
+local LspProgress = {
+  provider = require('lsp-progress').progress,
+  update = {
+    'User',
+    pattern = 'LspProgressStatusUpdated',
+    callback = vim.schedule_wrap(function()
+      vim.cmd('redrawstatus')
+    end),
+  }
+}
+
+local StatusLine = {
+  -- Other StatusLine components
+  { ... },
+  { ... },
+  LspProgress
+}
+
+require('heirline').setup({
+  statusline = StatusLine
+})
+```
+
 ## Configuration
 
 To configure options, please use: