api: remove multi package

The package has been deprecated and we don't want to support it
anymore. `pool` could be used instead of the package.

Closes #240

Author: oleg-jukovec

CHANGELOG.md

@@ -12,6 +12,10 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 
 ### Changed
 
+### Removed
+
+- multi subpackage (#240)
+
 ### Fixed
 
 ## [1.12.0] - 2023-06-07

Makefile

@@ -75,12 +75,6 @@ test-decimal:
 	go clean -testcache
 	go test -tags "$(TAGS)" ./decimal/ -v -p 1
 
-.PHONY: test-multi
-test-multi:
-	@echo "Running tests in multiconnection package"
-	go clean -testcache
-	go test -tags "$(TAGS)" ./multi/ -v -p 1
-
 .PHONY: test-queue
 test-queue:
 	@echo "Running tests in queue package"

README.md

@@ -27,6 +27,7 @@ faster than other packages according to public benchmarks.
   * [API reference](#api-reference)
   * [Walking\-through example](#walking-through-example)
   * [Migration to v2](#migration-to-v2)
+    * [multi package](#multi-package)
     * [msgpack.v5](#msgpackv5)
 * [Contributing](#contributing)
 * [Alternative connectors](#alternative-connectors)
@@ -158,6 +159,10 @@ There are two parameters:
 
 The article describes migration from go-tarantool to go-tarantool/v2.
 
+#### multi package
+
+The subpackage has been deleted. You could use `connection_pool` instead.
+
 #### msgpack.v5
 
 Most function names and argument types in `msgpack.v5` and `msgpack.v2`