doc: update according to the changes

Closes #321

README.md

@@ -109,16 +109,22 @@ import (
 	"context"
 	"fmt"
 	"time"
-	
+
 	"github.com/tarantool/go-tarantool/v2"
 )
 
 func main() {
-	opts := tarantool.Opts{User: "guest"}
-	ctx, cancel := context.WithTimeout(context.Background(), 
+	ctx, cancel := context.WithTimeout(context.Background(),
 		500 * time.Millisecond)
+	dialer := tarantool.NetDialer {
+		Address: "127.0.0.1:3301",
+		User: 	 "guest",
+	}
+	opts := tarantool.Opts{
+		Timeout: time.Second,
+	}
 	defer cancel()
-	conn, err := tarantool.Connect(ctx, "127.0.0.1:3301", opts)
+	conn, err := tarantool.Connect(ctx, dialer, opts)
 	if err != nil {
 		fmt.Println("Connection refused:", err)
 	}
@@ -135,27 +141,30 @@ func main() {
 **Observation 1:** The line "`github.com/tarantool/go-tarantool/v2`" in the
 `import(...)` section brings in all Tarantool-related functions and structures.
 
-**Observation 2:** The line starting with "`Opts :=`" sets up the options for
+**Observation 2:** The line starting with "`dialer :=`" creates dialer for
+`Connect()`. This structure contains fields required to establish a connection.
+
+**Observation 3:** The line starting with "`opts :=`" sets up the options for
 `Connect()`. In this example, the structure contains only a single value, the
-username. The structure may also contain other settings, see more in
+timeout. The structure may also contain other settings, see more in
 [documentation][godoc-opts-url] for the "`Opts`" structure.
 
-**Observation 3:** The line containing "`tarantool.Connect`" is essential for
+**Observation 4:** The line containing "`tarantool.Connect`" is essential for
 starting a session. There are three parameters:
 
 * a context,
-* a string with `host:port` format,
+* a dialer that was set up earlier,
 * the option structure that was set up earlier.
 
 There will be only one attempt to connect. If multiple attempts needed, 
 "`tarantool.Connect`" could be placed inside the loop with some timeout 
 between each try. Example could be found in the [example_test](./example_test.go), 
 name - `ExampleConnect_reconnects`.
 
-**Observation 4:** The `err` structure will be `nil` if there is no error,
+**Observation 5:** The `err` structure will be `nil` if there is no error,
 otherwise it will have a description which can be retrieved with `err.Error()`.
 
-**Observation 5:** The `Insert` request, like almost all requests, is preceded
+**Observation 6:** The `Insert` request, like almost all requests, is preceded
 by the method `Do` of object `conn` which is the object that was returned
 by `Connect()`.
 
@@ -187,6 +196,11 @@ The subpackage has been deleted. You could use `pool` instead.
   All created connections will be closed.
 * `pool.Add` now accepts context as first argument, which user may cancel in 
   process.
+* Now you need to pass `map[string]Dialer` to the `pool.Connect` as the second
+  argument, instead of a list of addresses. Each dialer is associated with a
+  unique string ID, which allows them to be distinguished.
+* `pool.GetPoolInfo` has been renamed to `pool.GetInfo`. Return type has been changed
+  to `map[string]ConnectionInfo`.
 
 #### crud package
 
@@ -248,6 +262,11 @@ now does not attempt to reconnect and tries to establish a connection only once.
 Function might be canceled via context. Context accepted as first argument, 
 and user may cancel it in process.
 
+Now you need to pass `Dialer` as the second argument instead of URI.
+If you were using a non-SSL connection, you need to create `NetDialer`.
+For SSL-enabled connections, use `OpenSslDialer`. Please note that the options
+for creating a connection are now stored in corresponding `Dialer`, not in `Opts`.
+
 #### Protocol changes
 
 * `iproto.Feature` type used instead of `ProtocolFeature`.