3.7.1 release branch (#1470)

* CHANGELOG
* README version updates
* No change needed to plotlywidget extension

Author: jonmmease

CHANGELOG.md

@@ -3,6 +3,13 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [3.7.1] - 2019-03-19
+
+### Fixed
+ - Fixed `.update` on numbered axis objects for Python < 3.6
+ ([#1462](https://github.com/plotly/plotly.py/issues/1462),
+ [#1464](https://github.com/plotly/plotly.py/pull/1464))
+
 ## [3.7.0] - 2019-03-08
 
 ### Updated

README.md

@@ -78,12 +78,12 @@ Built on top of [plotly.js](https://github.com/plotly/plotly.js), `plotly.py` is
 
 plotly.py may be installed using pip...
 ```
-pip install plotly==3.7.0
+pip install plotly==3.7.1
 ```
 
 or conda.
 ```
-conda install -c plotly plotly=3.7.0
+conda install -c plotly plotly=3.7.1
 ```
 
 ### Jupyter Notebook Support
@@ -132,7 +132,7 @@ jupyter labextension install [email protected] --no-build
 jupyter labextension install @jupyterlab/[email protected] --no-build
 
 # JupyterLab chart editor support (optional)
-jupyter labextension install jupyterlab-chart-editor@1.0 --no-build
+jupyter labextension install jupyterlab-chart-editor@1.1 --no-build
 
 # Build extensions (must be done to activate extensions since --no-build is used above)
 jupyter lab build