Add initial changelog (#243)

nmuesch · web-flow · commit 2ddcf2a82cec · 2020-04-22T16:47:43.000+02:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
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+# CHANGELOG
+
+## 1.0.0-beta.1 / 2020-04-22
+
+* [Added] Initial beta release of the Datadog API Client
