- a smooth prompt for missing plugins.
- infer the executable from the shebang, e.g., `#!/usr/bin/env python3`.
- visual ag and rg search based on fzf.
- `.editorconfig`
- `Grep` command
- introduce `on_event` to simplify lazy loading based on events.(#351)
- `haskell` layer
- `g:spacevim_lsp_prefer_coc`, add [coc.nvim](https://github.com/neoclide/coc.nvim) support for lsp layer.
- `spacevim#vim#term#Run()` could be used for running programms asynchronously.

- use `autocmd` provided by vim-plug instead of the built-in autoload approach.(#323)
- replace `spacevim#begin()` and `spacevim#end()` with `spacevim#bootstrap()`. The begin and end logic is not neccesary.
- optimize `core/autoload/spacevim.vim`.(#336)
- load `editorconfig-vim` via timer instead of on-demand loading.
- replace `vim-leaderGuide` with `vim-which-key`.
- replace `wannesm/wmgraphviz.vim` with `liuchengxu/graphviz.vim`.

- remove `unite` from the default layers.

- `core/autoload/spacevim/plug/youcompleteme.vim`: keep the config.vim of `ycmd` layer as concise as possible.
- defer loading `YouCompleteMe` via `timer` if possible.
- cscope layer. Fix #130.
- `vim-pythonsense`, `traces.vim`, `quick-scope` and `vim-gutentags`.
- add <kbd>SPC p s</kbd> for searching everything under your project, depending on `FindRootDirectory` provided by vim-rooter, if not, detecting whether in a git project.
- add <kbd>SPC p f</kbd> for searching files under a project.

- If the related layers are not enabled, finish loading the files under `core/ftplugin`.
- disable gui colors in the template `init.spacevim` by default.

- a bunch of global variables, like `g:spacevim_nvim`, `g:spacevim_vim8`, `g:spacevim_tmux`, have been moved to `g:spacevim`, which is dictionary containing the information used rarely by users.
- `SimpylFold`, `fzf-filemru`.