Snappass

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* Drop support for officially unsupported Python versions (< Python 3.7)

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* The ``HOST_OVERRIDE`` environment variable can be used to override the base URL. Useful when behind a reverseproxy.
* Upgrade to Jinja 2.11.3
* Upgrade to cryptography 3.3.2
* Returning json if request-mimetype is "application/json"
* Return template if password is expired (instead of 404)

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* Added support for "2 week" secret lifetimes.
* The ``NO_SSL`` environment variable is now propertly parsed.
* The ``URL_PREFIX`` environment variable can be used to add a prefix to URLs,
which is useful when running behind a reverse proxy like nginx.
* Prevent prefetching bots from destroying secrets.
* Replaced mockredis with fakeredis in the unit test environment.
* Added support for Python 3.8.

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* Various minor README and documentation improvements
* Upgrade to Jinja 2.10.1
* Fix autocomplete bug where hitting "back" would allow to autocomplete the password

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* Switch to local (non-CDN) Font Awesome assets
* Upgraded cryptography to 2.3.1 (for CVE-2018-10903, although snappass is
unaffected because it doesn't use the vulnerable ``finalize_with_tag`` API)

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*You will lose stored passwords during the upgrade to this version*
* Added a prefix in redis in front of the storage keys, making the redis safer to share with other applications
* Small test and syntax improvements