message: Move `gdefault` to "Vim settings" section of README
  It's definitely not an option specific to VSCodeVim.
diff: @@ -120,7 +120,6 @@ These settings are specific to VSCodeVim.
  | vim.overrideCopy | Override VS Code's copy command with our own, which works correctly with VSCodeVim. If cmd-c/ctrl-c is giving you issues, set this to false and complain [here](https://github.com/Microsoft/vscode/issues/217). | Boolean | false |
  | vim.searchHighlightColor | Set the color of search highlights | String | `findMatchHighlightBackground` ThemeColor |
  | vim.startInInsertMode | Start in Insert mode instead of Normal Mode | Boolean | false |
  -| vim.gdefault | `/g` flag in a substitute command replaces all occurrences in the line. Without this flag, replacement occurs only for the first occurrence in each line. With this setting enabled, the `g` is on by default. | Boolean | false |
  | vim.useCtrlKeys | Enable Vim ctrl keys overriding common VS Code operations such as copy, paste, find, etc. | Boolean | true |
  | vim.visualstar | In visual mode, start a search with `*` or `#` using the current selection | Boolean | false |
  | vim.highlightedyank.enable | Enable highlighting when yanking | Boolean | false |
  @@ -393,6 +392,7 @@ Configuration settings that have been copied from vim. Vim settings are loaded i
  | Setting | Description | Type | Default Value |
  | ---------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | ------------- |
  | vim.autoindent | Copy indent from current line when starting a new line | Boolean | true |
  +| vim.gdefault | When on, the `:substitute` flag `g` is default on. This means that all matches in a line are substituted instead of one. When a `g` flag is given to a `:substitute` command, this will toggle the substitution of all or one match. | Boolean | false |
  | vim.hlsearch | Highlights all text matching current search | Boolean | false |
  | vim.ignorecase | Ignore case in search patterns | Boolean | true |
  | vim.incsearch | Show the next match while entering a search | Boolean | true |
  