Issue title: Trying to use netty as WebSocket Server and this lib as client
 Issue body: What client sends me: https://mlgimg.xyz/f324edda

Client says error code 1002.

Any ideas?

Log:


WebSocketSharp.WebSocketException: The payload data of a frame cannot be read from the stream.
                              at WebSocketSharp.WebSocketFrame+<>c__DisplayClass77_0.<readPayloadDataAsync>b__0 (System.Byte[] bytes) [0x00000] in <filename unknown>:0 
                              at WebSocketSharp.Ext+<>c__DisplayClass54_0.<ReadBytesAsync>b__0 (IAsyncResult ar) [0x00000] in <filename unknown>:0 




WebSocketSharp.WebSocketException: An unsupported opcode.
                              at WebSocketSharp.WebSocketFrame.processHeader (System.Byte[] header) [0x00000] in <filename unknown>:0 
                              at WebSocketSharp.WebSocketFrame+<>c__DisplayClass73_0.<readHeaderAsync>b__0 (System.Byte[] bytes) [0x00000] in <filename unknown>:0 
                              at WebSocketSharp.Ext+<>c__DisplayClass54_0.<ReadBytesAsync>b__0 (IAsyncResult ar) [0x00000] in <filename unknown>:0 
 Comments: 
 Comment 0: How you solved that issue?
{'source': 'GithubIssues', 'repo_name_with_owner': 'sta/websocket-sharp', 'issue_id': 187285019, 'repo_stars': 4830.0}