exclude bolt 5.5, include 5.6

Author: MaxAake

packages/bolt-connection/src/bolt/handshake.js

@@ -19,7 +19,7 @@ import { alloc } from '../channel'
 import { newError } from 'neo4j-driver-core'
 
 const BOLT_MAGIC_PREAMBLE = 0x6060b017
-const AVAILABLE_BOLT_PROTOCOLS = [5.7, 5.5, 5.4, 5.3, 5.2, 5.1, 5.0, 4.4, 4.3, 4.2, 4.1, 4.0, 3.0]
+const AVAILABLE_BOLT_PROTOCOLS = [5.7, 5.6, 5.4, 5.3, 5.2, 5.1, 5.0, 4.4, 4.3, 4.2, 4.1, 4.0, 3.0] // bolt protocols the client supports, ordered by preference
 const DESIRED_CAPABILITES = 0
 
 function version (major, minor) {