Update dependencies

Description

Releases dependency-related changes from #260 that upgrades several dependencies to their latest versions and removes unused dependencies.

Fix lxml-related installation issues

Publishes changes made in #250 (thanks @aaronbannin !) to resolve #239 and some lxml-related issues when installing this package.

Fix broken parser, add deprecated teams

Publishes fixes in #242 (thanks @krlu!)

Add missing division

Thanks to @allanbelliti for adding a missing division in #218

Add include_inactive_games to player box scores methods

Added by #204.

Also includes integration test fixes from #210

Add API method to get standings

#203 added a standings client method to retrieve the standings for a given season.

The data it returns is the team, its wins and losses, and the division, and conference the team was in.

The main input is the season end year.

This should resolve #198.

Add API method for player box scores from playoff games

PR #200 resolved #194 by adding the playoff_player_box_scores method that gets box score statistics from playoff games.

This release also includes a refactoring of the output logic (#186) that should not have any breaking changes but hopefully consolidates the existing output logic.

Fix extra whitespace in search API method player name

Changes from #199 where the search API was returning a player's name with extra whitespace characters.

Fixes league values for players that did not play a season

Resolves #184

In each of the cases mentioned on the issue, the player did not participate for a given season.

In Alonzo Mourning's case it was due to illness

In Dominique Wilkins' case it was due to playing in other professional leagues

And in Rick Barry's case it was for legal reasons

So when parsing leagues from a player's page (when search redirects to player's page when they are only matching result) check to see if league is None.

Upgrade lxml to 4.5.1

Upgrade lxml to latest version.