link to ipynb updated

docs/index.html

@@ -342,6 +342,7 @@ <h1 class="title">Music and Science – Guide to Empirical Music Research (Book)
 <p>This repository contains the electronic materials for <em>Routledge</em> book titled <strong><a href="https://tuomaseerola.github.io/emr/">Music and Science – Guide to Empirical Music Research</a></strong> by <a href="https://www.durham.ac.uk/staff/tuomas-eerola/">Tuomas Eerola</a>, at <a href="https://www.durham.ac.uk">Durham University</a> and <a href="https://musicscience.net">Music and Science Lab</a>. The book is scheduled to be published in 2024.</p>
 <p>The materials are Jupyter notebooks with code examples in <a href="https://www.r-project.org/">R</a> or <a href="https://www.python.org/">Python</a>). The notebooks are designed to be run in <a href="https://colab.research.google.com/">Google Colab</a> within a browser. Colab service is free and does not require any installations or software. It is also possible to run the notebooks within a <a href="https://jupyter-notebook-beginner-guide.readthedocs.io/en/latest/index.html">Jupyter server in your own computer</a> or to use the code directly in R or in Python. See <a href="./Technical.html">technical notes</a> about the notebooks and package versions in Colab.</p>
 <p>The public-facing version of this repository is at <a href="https://tuomaseerola.github.io/emr/">https://tuomaseerola.github.io/emr/</a>. See <a href="./Citation.html">citation</a> for bibliographic details of the book.</p>
+<p><code>ver 5/4/2024</code></p>
 <section id="contents" class="level1">
 <h1>Contents</h1>
 <table class="table">
@@ -362,8 +363,8 @@ <h1>Contents</h1>
 </tr>
 <tr class="even">
 <td style="text-align: left;">&nbsp;&nbsp;<a href="./Chapter1.html">Ch. 1 - Notebook basics</a></td>
-<td style="text-align: left;"><a href="https://github.com/tuomaseerola/emr/blob/master/nb/Chapter1.ipynb">Chapter1.ipynb</a></td>
-<td style="text-align: left;"><a href="https://colab.research.google.com/github/tuomaseerola/emr/blob/master/nb/Chapter1.ipynb"><img src="https://colab.research.google.com/assets/colab-badge.svg" class="img-fluid" alt="Colab"></a></td>
+<td style="text-align: left;"><a href="https://github.com/tuomaseerola/emr/blob/main/nb/Chapter1.ipynb">Chapter1.ipynb</a></td>
+<td style="text-align: left;"><a href="https://colab.research.google.com/github/tuomaseerola/emr/blob/main/nb/Chapter1.ipynb"><img src="https://colab.research.google.com/assets/colab-badge.svg" class="img-fluid" alt="Colab"></a></td>
 <td style="text-align: left;">R</td>
 </tr>
 <tr class="odd">