Add changelog

hollasch · hollasch · commit 2b74dbf77b98 · 2018-08-26T23:54:44.000-07:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
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+Change Log — _Ray Tracing: The Next Week_
+================================================================================
+
+v1.42.0  (2018-08-26)
+----------------------
+  - The _Ray Tracing in One Weekend_ book series is now free!
+  - First GitHub release of the book, bundled with source code.
+
