Leaderboards update

Added leaderboard data reset for leaderboards V1; added leaderboards V2

v1.2.6

Fixed

• Fixed calculation of minutes in timeLeft helper function.

v1.2.5

Added

• Add number of days to timeLeft helper function.
• Added pre-built browser bundle to published package.

Changed

• Use prepare instead of postinstall for improved npm compatibility.
• Improved compatibility with Angular, Vue.js and React apps.

Fixed

• Resolved circular dependency related to monitoring of Challenges and Battle Passes.

v1.2.1

Added

• Added challenge_goal_condition to the BattlePassLevel object.
• Added level_reward_type to the BattlePassLevel object.

Deprecated

• challenge_reward_type should not be used anymore as it has been replaced by level_reward_type in BattlePassLevel