chore: remove Unreleased header (#864)

fbogsany · web-flow · commit be23975d77b3 · 2021-07-07T12:34:18.000-04:00
diff --git a/semantic_conventions/CHANGELOG.md b/semantic_conventions/CHANGELOG.md
@@ -1,7 +1,5 @@
 # Release History: opentelemetry-semantic_conventions
 
-### Unreleased
-
 ### v1.4.0 / 2021-07-07
 
 * Initial release.
