Add two factor authentication#106

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dissidente:issue-36-2FA-auth

Commits on Apr 22, 2020

ADD: alias command attribute
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Commits on Apr 26, 2020

ADD: main 2FA functions and .2fa command
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Commits on Apr 27, 2020

Commits on May 1, 2020

CHANGE: Replaced speakeasy library by otpauth for 2FA
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