[#165] CHANGELOG: Update for v0.16.0 release

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

CHANGELOG.md

@@ -2,6 +2,42 @@
 
 This document outlines major changes between releases.
 
+## 0.16.0 (16 Jul 2021)
+
+With this release we publish S3 gateway source code. It includes various S3
+compatibility improvements, support of bucket management, unified secp256r1
+cryptography with NEP-6 wallet support.
+
+### Fixed
+ * Allowed no-sign request (#65).
+ * Bearer token attached to all requests (#84).
+ * Time format in responses (#133).
+ * Max-keys checked in ListObjects (#135).
+ * Lost metadat in the objects (#131).
+ * Unique bucket name check (#125).
+
+### Added
+ * Bucket management operations (#47, #72).
+ * Node-specific owner IDs in bearer tokens (#83).
+ * AWS CLI usage section in README (#77).
+ * List object paging (#97).
+ * Lifetime for the tokens in auth-mate (#108).
+ * Support of range in GetObject request (#96).
+ * Support of NEP-6 wallets instead of binary encoded keys (#92).
+ * Support of JSON encoded rules in auth-mate (#71).
+ * Support of delimiters in ListObjects (#98).
+ * Support of object ETag (#93).
+ * Support of time-based conditional CopyObject and GetObject (#94).
+
+### Changed
+ * Accessbox is encoded in protobuf format (#48).
+ * Authentication uses secp256r1 instead of ed25519 (#75).
+ * Improved integration with NeoFS SDK and NeoFS API Go (#78, #88).
+ * Optimized object put execution (#155).
+
+### Removed
+ * GRPC keepalive options (#73).
+
 ## 0.15.0 (10 Jun 2021)
 
 This release brings S3 gateway to the current state of NeoFS and fixes some