restore composer.json, add mysqli extension

public/vendor/editor/MAINTAIN.md

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+## Debug with VSCode
+
+You can debug unit tests with VSCode following the steps:
+(Based on [article](http://blog.mlewandowski.com/Debugging-Karma-tests-with-VSCode.html))
+
+1. Install [VsCode](https://code.visualstudio.com/docs/setup/setup-overview)
+2. Install [debugger-for-chrome](https://marketplace.visualstudio.com/items?itemName=msjsdiag.debugger-for-chrome) extension.
+3. Create launch.json file on ~/.vscode folder with follow config:
+```json
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "chrome",
+      "request": "attach",
+      "name": "Attach Karma Chrome",
+      "address": "localhost",
+      "port": 9333,
+      "sourceMaps": true,
+      "pathMapping": {
+        "/": "${workspaceRoot}",
+        "/base/": "${workspaceRoot}/"
+      }
+    }
+  ]
+}
+```
+4. On terminal, run test with command:
+```
+npm run test:debug
+```
+4. Open vscode
+5. Set breakpoint on code
+6. Press F5 to run Debug and wait to stop on breakpoint
+
+## Publish new version
+
+### 1. `develop` to `master`
+
+Send pull request `develop` to `master` on github repository and merge it.
+https://github.com/summernote/summernote/compare/master...develop
+
+
+### 2. Build dist files
+
+Build dist files and push to master
+```bash
+# change branch
+git checkout master
+
+# fetch all changes
+git pull
+
+# Bump version in package.json
+
+# build dist files and binary(.zip) for release post
+npm run build
+
+# Commit and add tag for new version
+git commit -a -m "Update dist files"
+git tag -a "<new-version>"
+
+# Push new dist files and tags to remote repository.
+git push origin --tags
+```
+
+### 3. Release new version
+Post release note with new tag version on github
+
+https://github.com/summernote/summernote/releases/new
+
+### 4. Publish
+
+Publish on npm
+```bash
+npm publish
+```
+
+### 5. Update summernote.github.io
+Update summernote version in `_config.yml`.
+
+### 6. Update connectors
+Request maintainers of each connector to update package information.