Jupyterlab-code-formatter

**Server extension**

- Support `formatr` - A R code formatter - courtesy of dev-wei;

**Jupyterlab extension**

- Support `formatr` - A R code formatter - courtesy of dev-wei;

**General**

- Minor updates to README - courtesy of reza1615;


**Server extension**

No Change

**Jupyterlab extension**

- Support Jupyterlab ^1.0.0 - courtesy of gnestor;
- Remove custom_style enum restriction - courtesy of CaselIT;
- Add companion packages info;

Same as v0.2.2 - Re-publishing because I messed up the versioning.

**General**

- Minor updates to README - courtesy of akashlakhera and mzakariaCERN;

**Server extension**

No Change

**Jupyterlab extension**

- Remove some excessive logging - courtesy of jtpio;
- Make formatter commands visible for Python files and notebooks only - courtesy of jtpio;

**General**

- Add Binder to README - courtesy of jtpio;
- Add a test notebook for easier testing with Binder;

**Server extension**

- Add LICENSE in sdist - courtesy of xhochy;
- Handle the exsistence of magic commands in codecell for Black - courtesy of Lif3line;

**Jupyterlab extension**

No Change

- Handle format_str interface change for black>=19.3b0;
- Support Isort as a formatter;
- Bugfixes - courtesy of gnestor;