Release v2.0.0

Changes

• Added a new banner type FloatGrowingNotificationBanner . (Huge thanks to @mrsnow-git! 👍 👍 👍 )
• Added a function to reset a banner's elapsed duration to zero. (Thanks @ecastillo! 👍)
• Fixed an issue within the NotificationBannerUtilities class. (Thanks @Lausbert! 👍)
• Updated podspec to use SnapKit 4.2.0. (Thanks @anelad! 👍)