crud: replace usage of optional types in crud with go-option

Changelog.md.
fixed #492

Author: New year

CHANGELOG.md

@@ -12,6 +12,8 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 
 * New types for MessagePack extensions compatible with go-option (#459).
 * Added `box.MustNew` wrapper for `box.New` without an error (#448).
+* Added missing IPROTO feature flags to greeting negotiation
+  (iproto.IPROTO_FEATURE_IS_SYNC, iproto.IPROTO_FEATURE_INSERT_ARROW) (#466).
 
 ### Changed
 
@@ -24,6 +26,7 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
   and Future.GetIterator() methods, ResponseIterator and TimeoutResponseIterator types,
   Future.pushes[] (#480).
 * `LogAppendPushFailed` replaced with `LogBoxSessionPushUnsupported` (#480)
+* Replaced the use of optional types in crud with go-option library (#492).
 
 ### Fixed
 
@@ -45,8 +48,7 @@ flag handling, and fixes watcher panic.
   Now you can check this error with `errors.Is(err, tarantool.ErrConcurrentSchemaUpdate)`.
 - Implemented support for `IPROTO_IS_SYNC` flag in stream transactions,
   added `IsSync(bool)` method for `BeginRequest`/`CommitRequest` (#447).
-- Added missing IPROTO feature flags to greeting negotiation
-  (iproto.IPROTO_FEATURE_IS_SYNC, iproto.IPROTO_FEATURE_INSERT_ARROW) (#466).
+
 
 ### Fixed