clean(room): remove useless function (#273)

src/room.ts

@@ -194,7 +194,9 @@ export class Room extends EventEmitter implements Sayable {
       return null
     }
 
-    const memberList = this.parseMemberList(rawObj.MemberList || [])
+    const memberList = (rawObj.MemberList || [])
+                        .map(m => Contact.load(m.UserName))
+
     const nameMap    = this.parseMap('name', rawObj.MemberList)
     const aliasMap   = this.parseMap('alias', rawObj.MemberList)
 
@@ -209,12 +211,6 @@ export class Room extends EventEmitter implements Sayable {
     }
   }
 
-  private parseMemberList(rawMemberList: RoomRawMember[]): Contact[] {
-    if (!rawMemberList || !rawMemberList.map) {
-      return []
-    }
-    return rawMemberList.map(m => Contact.load(m.UserName))
-  }
   private parseMap(parseContent: NameType, memberList?: RoomRawMember[]): Map<string, string> {
     const mapList: Map<string, string> = new Map<string, string>()
     if (memberList && memberList.map) {