Update changelog and readme

Changelog.md

@@ -5,6 +5,7 @@
 * Add convolve() method. A convolution method (default to fft). Now you can apply reverb, do autocorrelation to the signal.
 * Update Ugen docstring and remove deprecated variable names
 * namespace improvement.
+* `sanic` and `notebook` are now optional: If you plan to use `JupyterBackend`, install `pya` with `pip install pya[remote]`
 
 ## 0.4.0 (April 2020)
 * new Amfcc class for MFCC feature extraction

README.md

@@ -7,7 +7,7 @@
 |------:|--------:|---------:|
 |[CI-Linux/MacOS](https://travis-ci.org/interactive-sonification/pya) | ![Build Status Travis](https://travis-ci.org/interactive-sonification/pya.svg?branch=master) | ![Build Status Travis](https://travis-ci.org/interactive-sonification/pya.svg?branch=develop) |
 |[CI-Windows](https://ci.appveyor.com/project/aleneum/pya-b7gkx/)| ![Build status AppVeyor](https://ci.appveyor.com/api/projects/status/vn61qeri0uyxeedv/branch/master?svg=true) | ![Build status AppVeyor](https://ci.appveyor.com/api/projects/status/vn61qeri0uyxeedv/branch/develop?svg=true) | 
-|Changes|[![GitHub commits](https://img.shields.io/github/commits-since/interactive-sonification/pya/v0.4.0/master.svg)](https://github.com/interactive-sonification/pya/compare/v0.4.0...master) | [![GitHub commits](https://img.shields.io/github/commits-since/interactive-sonification/pya/v0.4.0/develop.svg)](https://github.com/interactive-sonification/pya/compare/v0.4.0...develop) |
+|Changes|[![GitHub commits](https://img.shields.io/github/commits-since/interactive-sonification/pya/v0.4.1/master.svg)](https://github.com/interactive-sonification/pya/compare/v0.4.1...master) | [![GitHub commits](https://img.shields.io/github/commits-since/interactive-sonification/pya/v0.4.1/develop.svg)](https://github.com/interactive-sonification/pya/compare/v0.4.1...develop) |
 |Binder|[![Master Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/interactive-sonification/pya/master?filepath=examples%2Fpya-examples.ipynb) | [![Develop Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/interactive-sonification/pya/develop?filepath=examples%2Fpya-examples.ipynb) |
 
 ## What is pya?