updated cooling notebook and readme

Author: FoleyLab

README.md

@@ -15,16 +15,16 @@ on Windows, Mac, or Linux platforms
 - To install from github: 
    * `git clone https://github.com/FoleyLab/wptherml.git`
    * `cd wptherml`
-   * `python setup.py install`
+   * `python3 setup.py install`
 
 - To run unit tests from cloned repository:
    * `cd test`
-   * `python -m pytest test.py`
+   * `python3 -m pytest test.py`
 
 - The test script for running unit tests can be downloaded [here](https://github.com/FoleyLab/wptherml/blob/master/example/test/test.py)
 
-- To install with pip:
-   * `pip install wptherml`
+- To install with pip3:
+   * `pip3 install wptherml`
 
 
 - Open a new .py file in your favorite text editor or IDE, e.g.
@@ -68,7 +68,7 @@ plt.show()
 
 - Save this script and run it either in the terminal as
 
-`python example.py`
+`python3 example.py`
 
 where example.py is the name of the file you created, or if you were doing this in an IDE, execute it within your IDE!