add note about wrong chapter reference

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: 85$
+- Amount for the next donation: 90$
 - Amount donated: 0$
 
 
@@ -19,6 +19,7 @@ Contributor list:
 6. Oliver Tomic ($20)
 7. gabramson ($15)
 1. Gogy ($10)
+12. Haesun Park ($10)
 2. Christian Geier ($5)
 3. Pieter Algra / Carlos Zada ($5)
 4. @gabramson ($5)
@@ -30,6 +31,7 @@ Contributor list:
 11. Poon Ho Chuen ($5)
 
 
+
 <br>
 <br>
 <br>
@@ -68,15 +70,22 @@ pg. 55
 
 pg. 56
 
-Wrong chapter reference in the info box: 
+Earlier prints of the book had a chapter reference in the info box: 
 
 > In ~Chapter 5, Compressing Data via Dimensionality Reduction~ {Chapter 6: Learning Best Practices for Model Evaluation and Hyperparameter Tuning}, you will learn about useful techniques, including graphical analysis such as learning curves, to detect and prevent overfitting.
 
+pg. 81
+
+On pg. 81, I incorrectly state that the `Perceptron` class uses LIBLINEAR. It uses a regular SGD implementation instead for optimization.
 
 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. 99
+
+There is a wrong chapter reference at the bottom of this page. It should be *Chapter 6* and not *Chapter 5*.
+
 pg. 101
 
 The text description references "entropy" as the impurity criterion being used in the `RandomForestClassifier`. However, `"gini"` is used in the code example, and thus "entropy" should be changed to "gini" in the text as well.