iproto: provide new features codes

Pagination was added in Tarantool 2.11.0-rc1 [1]. Space and index names
support will be added to Tarantool 3.0 [2]. Watch once feature will be
added to Tarantool 3.0 [3].

1. tarantool/tarantool@948e5cd
2. tarantool/tarantool@b9550f1
3. tarantool/tarantool@6dc1433

Part of #267

tarantool/const.py

@@ -99,6 +99,9 @@
 IPROTO_FEATURE_TRANSACTIONS = 1
 IPROTO_FEATURE_ERROR_EXTENSION = 2
 IPROTO_FEATURE_WATCHERS = 3
+IPROTO_FEATURE_PAGINATION = 4
+IPROTO_FEATURE_SPACE_AND_INDEX_NAMES = 5
+IPROTO_FEATURE_WATCH_ONCE = 6
 
 # Default value for connection timeout (seconds)
 CONNECTION_TIMEOUT = None
@@ -133,8 +136,8 @@
 # Default delay between attempts to reconnect (seconds)
 POOL_INSTANCE_RECONNECT_DELAY = 0
 
-# Tarantool 2.10 protocol version is 3
-CONNECTOR_IPROTO_VERSION = 3
+# Tarantool master 970ea48 protocol version is 6
+CONNECTOR_IPROTO_VERSION = 6
 # List of connector-supported features
 CONNECTOR_FEATURES = [IPROTO_FEATURE_ERROR_EXTENSION]