Holdup

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* Added a ``--version`` argument.
* Changed verbose output to mask passwords in postgresql checks.

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* Add support for PostgreSQL 12+ clients (strict integer type-checking on ``connect_timeout``). The float is now converted to an integer.

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* Added a PostgreSQL check. It handles the ``the database system is starting up`` problem.
Contributed by Dan Ailenei in :pr:`6`.
* Changed output so it's more clear and more brief:

* arguments (checks) are quoted when printed,
* "any" checks give exact info about what made it pass,
* repetitive information is removed.
* Simplified the internals for the "AnyCheck".

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* Added support for skipping SSL certificate verification for HTTPS services
(the ``--insecure`` option and ``https+insecure`` protocol).
Contributed by Mithun Ayachit in :pr:`2`.

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* Added verbose mode (`-v` or ``--verbose``).
* Changed default timeout to 60s (from 5s).

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* Added an ``eval://expression`` protocol for weird user-defined checks.