Update acknowledgments.tex

src/acknowledgments.tex

@@ -1,7 +1,6 @@
 \noindent
 I’d like to thank Edward Kmett and Gershom Bazerman for checking my math
-and logic, and André van Meulebrouck, who has been volunteering his editing
-help throughout this series of posts.
+and logic. I'm grateful to many volunteers who corrected my mistakes and improved the book.
 
 \vspace{1.0em}
 \noindent
@@ -14,5 +13,4 @@
 clever implementation of \code{compose} that uses advanced features of
 C++14 to drive type inference. I was able to cut the whole section of
 old fashioned template magic that did the same thing using type traits.
-Good riddance! I'm also grateful to Gershom Bazerman for useful comments
-that helped me clarify some important points.
+Good riddance!