Update install instructions so we aren’t trying to get numpy from conda-forge, because it isn’t there for Windows.

Author: jasongrout

README.md

@@ -2,27 +2,30 @@
 
 ## Tutorial, JupyterCon 2017
 
-# Installation -- last updated 22 Aug, 4PM EDT
+# Installation
 
-The code in the tutorial has been written using Python 3; though it may also work with Python 2.7, it has not been tested extensively against that version.
+The code in the tutorial has been written using Python 3; though most of it may also work with Python 2.7.
 
 We **strongly recommend** using the Anaconda Python distribution. You can install either the full [anaconda distribution](https://www.continuum.io/downloads) (very extensive, but large) or [miniconda](https://conda.io/miniconda.html) (much smaller, only essential packages).
 
-There are download instructions below for installation using pip, which should work with any Python distribution, and the script for checking your installation should run on any Python.
+There are download instructions below for installation using pip, which should work with any Python distribution.
 
 ## anaconda/miniconda installation instructions
 
 The steps below will get you a working environment.
 
 ```
-conda create -c conda-forge -n widgets-tutorial notebook=5.0 ipywidgets=7.0 numpy=1.13.1 python=3.6 scikit-image=0.13.0 scipy=0.19.1 traittypes
+conda create -n widgets-tutorial notebook=5.0 numpy python=3.6 scikit-image scipy traittypes
 
 # Mac/Linux:
 source activate widgets-tutorial
 
 # Windows:
 activate widgets-tutorial
 
+# Install widgets from conda-forge, which has ipywidgets 7.0
+conda install -c conda-forge ipywidgets=7.0
+
 # Create a kernel for this environment
 ipython kernel install --name widgets-tutorial --display-name widgets-tutorial --sys-prefix
 ```
@@ -36,17 +39,9 @@ pip install ipywidgets
 jupyter nbextension enable --sys-prefix --py widgetsnbextension
 ```
 
-## Testing your installation
-
-To check your installation, please download the script [install_check.py](https://raw.githubusercontent.com/mwcraig/scipy2017-jupyter-widgets-tutorial/master/install_check.py) and run it:
-
-```
-python install_check.py
-```
-
 ## Tutorial materials
 
-To get the tutorial materials, clone this repository. **Please plan to update the materials shortly before the tutorial.**
+To get the tutorial materials, clone this repository.
 
 ## Running into trouble?