[bugfix] Tab: should scroll to active tab when inited (youzan#2857)

[new feature] Button: add info type (youzan#2831)

[new feature] Tabs: add title-active-color、title-inactive-color prop (y…

…ouzan#2773)

[bugfix] Sku: buy event incorrect triggered (youzan#2741)

[bugfix] Dialog: missing animation when first rendered

[new feauture] PullRefresh: add success-text、success-duration props (y…

…ouzan#2709)

[bugfix] Functional component inherit context (youzan#2686)

[improvement] add weapp-nav icon (youzan#2682)

[new feature] Field: add click-left-icon event (youzan#2605)

[new feature] SwitchCell: add active-value & inactive-value prop (you…

…zan#2591)