picker(git_branch): show committer, upstream and date (#695)

* wip: rich finder for branches

for: https://github.com/nvim-telescope/telescope.nvim/issues/569

* fix some diagnostics

lua/telescope/builtin/files.lua

@@ -401,7 +401,11 @@ files.tags = function(opts)
 end
 
 files.current_buffer_tags = function(opts)
-  return files.tags(vim.tbl_extend("force", {prompt_title = 'Current Buffer Tags', only_current_file = true, hide_filename = true}, opts))
+  return files.tags(vim.tbl_extend("force", {
+    prompt_title = 'Current Buffer Tags',
+    only_current_file = true,
+    hide_filename = true,
+  }, opts))
 end
 
 local function apply_checks(mod)