Add changelog

hollasch · hollasch · commit 0abfd4c3e0d6 · 2018-08-26T23:54:37.000-07:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
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+Change Log — _Ray Tracing in One Weekend_
+================================================================================
+
+v1.54.0  (2018-08-26)
+----------------------
+  - The _Ray Tracing in One Weekend_ book series is now free!
+  - First GitHub release of the book, bundled with source code.
+
