message: Update environments.json
  Add `document`, `frame`, `columns` and `column` environments.
  The last three ones are used in `beamer` class.
diff: {
  + "document":{
  + "text":"document"
  + },
  "figure":{
  "text":"figure"
  },
  },
  "titlepage":{
  "text":"titlepage"
  + },
  + "frame":{
  + "text":"frame"
  + },
  + "columns":{
  + "text":"columns"
  + },
  + "column":{
  + "text":"column"
  }
  }
  