Acknowledge myself for being such a nice guy

Author: dimitry-ishenko

books/acknowledgments.md.html

@@ -34,6 +34,7 @@
   - Dan Drummond
   - [David Chambers](https://github.com/dafhi)
   - David Hart
+  - [Dimitry Ishenko](https://github.com/dimitry-ishenko)
   - [Dmitry Lomov](https://github.com/mu-lambda)
   - [Eric Haines](https://github.com/erich666)
   - Fabio Sancinetti