Update book1.html

book1.html

@@ -1,7 +1,7 @@
 <h1>Probabilistic Machine Learning: An Introduction</h1>
 by <a href="https://www.cs.ubc.ca/~murphyk/">Kevin Patrick Murphy</a>.
 <br>
-	MIT Press, February  2022.
+	MIT Press, March  2022.
 
 <p>
 <img src="figures/cover1-v2.png"
@@ -23,7 +23,7 @@ <h2>Key links</h2>
     Draft pdf file</a>.  CC-BY-NC-ND license. (Please cite the official reference below.)
 
 	  <li> <a href="https://www.amazon.com/Probabilistic-Machine-Learning-Introduction-Computation/dp/0262046822/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=&sr=">
-		  Pre-order hardcopy from Amazon</a> (expected release date: February 2022).
+		  Pre-order hardcopy from Amazon</a> (expected release date: March 2022).
 
 	<li> <a href="https://github.com/probml/pml-book/tree/main/pml1/figures/images">All the figures</a> (png files)
 
@@ -257,7 +257,6 @@ <h2><a id="ack"></a>Acknowledgements</h2>
 Max Lepikhin,
 Aaron Michelony,
 	      Horst Stühler,
-Hal Varian,
 	      Clem Wang.