Add a new property 'isMyMsg' to messagePayload

[ericcug]

Get isMyMsg from offset 0x3C, int 1 is MyMessage and 0 is non-MyMessage.

[CLAassistant]

All committers have signed the CLA.

[huan]

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[huan]

Please make sure the following requirements have been met for your PR before we can continue reviewing it:

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[huan]

There has a strange error message that prevents the CI turns green after merging this PR.

@ericcug could you please take a look at it and see what happened?

Thank you very much.

[ericcug]

What message is? Maybe it relates to npm version in package.json? I see that @atorber had fix it. It could be the case that I have revert package.json file and commit it in mistake.

[huan]

It seems that @atorber has already fixed it in the latest commit.

Thank you very much!

[atorber]

@ericcug have you add @lijiarui wechat: ruirui_0914 ，we want invite you into Wechaty Puppet XP Contributor Room.

[ericcug]

@atorber not yet. Add right now