Tokendito

We expanded our testing to cover more use cases, and fixed a few bugs
along the way.

For this release, we've improved the output for interactive users so they can better identify their different MFA methods

E.g. old output:

Select your preferred MFA method and press Enter:
[0] DUO web
[1] OKTA push
[2] OKTA call
[3] OKTA sms
[4] GOOGLE token:software:totp
[5] FIDO webauthn
[6] FIDO webauthn
[7] OKTA token:software:totp

New output:

Select your preferred MFA method and press Enter:
[0] DUO web (DUO)
[1] OKTA push (My Phone)
[2] OKTA call (+1 XXX-XXX-1212)
[3] OKTA sms (+1 XXX-XXX-1212)
[4] GOOGLE token:software:totp (jane.doeacme.org)
[5] FIDO webauthn (MacBook Touch ID)
[6] FIDO webauthn (YubiKey 5c)
[7] OKTA token:software:totp (jane.doeacme.org)

This release fixes previously unhandled cases, and improves error
messages.

Major Feature:
Add interactive command-line support for Duo MFA

Minor feature:
Unified input validation across all end-user interaction

Not included in this release:
Environment variable support for pre-configurable Duo parameters.

Changes since 1.0.0 are:
* Documentation fixes
* Minor bugfixes
* Improvements in testability
* Support for python 3.5 through 3.8