fix: unable to open files with $ character in

Ref: #41

lua/ivy/utils.lua

@@ -74,7 +74,7 @@ utils.file_action = function()
       return
     end
 
-    vim.cmd(command .. " " .. file)
+    vim.cmd(command .. " " .. utils.escape_file_name(file))
   end
 end
 
@@ -85,4 +85,8 @@ utils.line_action = function()
   end
 end
 
+utils.escape_file_name = function(input)
+  return string.gsub(input, "([$])", "\\%1")
+end
+
 return utils