CHANGELOG: release 0.15.0

Signed-off-by: Roman Khimov <roman@nspcc.ru>

CHANGELOG.md

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+# Changelog
+
+This document outlines major changes between releases.
+
+## 0.15.0 (10 Jun 2021)
+
+This release brings S3 gateway to the current state of NeoFS and fixes some
+bugs, no new significant features introduced (other than moving here already
+existing authmate component).
+
+New features:
+ * authmate was moved into this repository and is now built along with the
+   gateway itself (#46)
+
+Behavior changes:
+ * neofs-s3-gate was renamed to neofs-s3-gw (#50)
+
+Improvements:
+ * better Makefile (#43, #45, #55)
+ * stricter linters (#45)
+ * removed non-standard errors package from dependencies (#54)
+ * refactoring, reusing new sdk-go component (#60, #62, #63)
+ * updated neofs-api-go for compatibility with current NeoFS node 0.21.0 (#60,
+   #68)
+ * extended README (#67, #76)
+
+Bugs fixed:
+ * wrong (as per AWS specification) access key ID generated (#64)
+
+## Older versions
+
+Please refer to [Github
+releases](https://github.com/nspcc-dev/neofs-s3-gw/releases/) for older
+releases.