errata note

docs/errata/README.md

@@ -7,7 +7,7 @@ To turn those annoyances into something positive, I will donate $5 to [UNICEF US
 Also below, I added a small leaderboard to keep track of the errata submissions and errors you found. Please let me know if you don't want to be explicitely mentioned in that list! 
 
 
-- Amount for the next donation: 15$
+- Amount for the next donation: 20$
 - Amount donated: 0$
 
 
@@ -19,6 +19,7 @@ Contributor list:
 
 1. Gogy ($10)
 2. Christian Geier ($5)
+3. Pieter Algra / Carlos Zada ($5)
 
 
 <br>
@@ -42,6 +43,25 @@ pg. 91
 
 On the top of the page, it says "Here, p (i | t ) is the proportion of the samples that belong to class c." The "*c*" should be changed to *i*.
 
+pg. 136
+
+The print version is incorrectly shows 
+
+```python
+>>> plt.xticks(range(X_train.shape[1]),
+...            feat_labels, rotation=90)
+```
+
+instead of 
+
+```python
+>>> plt.xticks(range(X_train.shape[1]),
+...            feat_labels[indices], rotation=90)
+```
+
+It seems that I did it correctly in the notebook. Also, the list of feature importances and the plot seem to be correct in the book. However, somehow the [indices] array index went missing in the print version.
+
+
 pg. 155
 
 ![](./images/pg155.png)