* Patch sleeper fetch endpoints (#77)

* patch sleeper api to not require conn

* remove hardcoded year

* patch userleagues for multi-user

* patch sleeper_userleagues for name consistency

* silently swallow up unused args in mfl_connect and sleeper_connect

* patch login cache issue

* update tests to checkmate pkg for better readability

* update description, bump minor ver

* fixup! update description, bump minor ver

* add comment on httr handle reset to news

* add note about unused args

* add sleeper schedule functionality

* remove duplicated mfl_players call

* start work on sleeper-standings

* wrap up standings and add franchises

* add tests for sleeper standings, franchises etc

* apply styler

* patch schedule results bug

* create separate rate-limits for MFL and Sleeper

* update documentation

* add sleeper_rosters

* cut metadata out of sleeper_players to increase speed

* add tests for sleeper_rosters

* bumpver

* add tests

* memoise sleeper fns

* add ff_draftpicks changes

* add tests

* add fixes to get tests to pass

* bumpver