Add socket option to mockRequest

[DorianBlues]

Overview

I use node-mocks-http with koa2. when I call ctx.cookies.get() methd in koa2 customer middleware，it throw an error："TypeError: Cannot read property 'encrypted' of undefined".

Suggestions

I found that Koa2 check it's this.socket.encrypted when user call ctx.cookies.get() methd, It seems that the node-mocks-http mockRequest instance need a socket property.

[eugef]

Hi @DorianBlues thanks for the PR.

Please also update the Readme https://github.com/howardabrams/node-mocks-http#createrequest

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