Coc.py

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- Fixes an issue where `Clan.members` was empty if `Clan.get_member` was called before `Clan.members`.
There was a similar issue with `Player.heroes` and `Player.spells`.

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- Adds new achievements and updated the order of existing ones.

- Added :attr:`Player.super_troops` and :attr:`Player.pets`.

- Added :attr:`Troop.is_active` to check whether a super troop is active.

- Added :attr:`WarAttack.duration`

- Added :attr:`Clan.chat_language` which is a :class:`ChatLanguage` object.

- Fixed errors when coc.py tried to parse 5xx (e.g. 502) errors as HTML when they were dicts.

- Improved docs for :attr:`RankedPlayer.previous_rank`.

- Adds support for the new Player API verification endpoint - see :meth:`Client.verify_player_token`

- Fixes a bug where members in `clan.get_detailed_members()` wouldn't have the `clan_rank` attribute, for example::

before
async for member in clan.get_detailed_members():
print(member.clan_rank) prints "None"

after
async for member in clan.get_detailed_members():
print(member.clan_rank) prints "1" or "10" or their clan rank.


- Fixes a bug where getting the warlog failed for clans with (>3yr) old war logs. See <https://github.com/mathsman5133/coc.py/issues/72>

- Fixed docs for :attr:`Player.clan_previous_rank` since it was misleading before.

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- Fixed an issue where the HTTP cache layer was not being utilised.

- Fixed an issue where :meth:`utils.get_season_start` and :meth:`utils.get_season_end` got the previous season information
if the system time had not yet passed 5am UTC.

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- Fixed an issue where hitting Maintenance errors when using the normal Client would raise an Attribute Error.

- Fixed an issue where using `Clan.get_member` without calling `Clan.members` would build an incorrect player lookup dict.

- Fixed an issue where events wouldn't start because the maintenance event wasn't set properly.