Line-bot-sdk

New Features
* Add display_text in PostbackAction (https://github.com/line/line-bot-sdk-python/pull/110)

Bug fixes
* Fix Issue-111 (https://github.com/line/line-bot-sdk-python/pull/113)

Trivial fixes
* Improve __str__ of LineBotApiError (https://github.com/line/line-bot-sdk-python/pull/112)

New Features
* none

Bug fixes
* Fix AccountLinkEvent's source property (https://github.com/line/line-bot-sdk-python/pull/109)

Trivial fixes
* none

New Features
* Implement flex message feature (https://github.com/line/line-bot-sdk-python/pull/107)
* Add AccountLinkEvent (https://github.com/line/line-bot-sdk-python/pull/105)

Bug fixes
* nothing

Trivial fixes
* nothing

New Features

* Add FileMessage (https://github.com/line/line-bot-sdk-python/pull/65)

Bug fixes

* nothing

Trivial fixes

* nothing

New Features

* Add Get Group/Room Member Profile API (https://github.com/line/line-bot-sdk-python/pull/53)
* Fix super class to Template for CarouselTemplate.(https://github.com/line/line-bot-sdk-python/pull/56)
* Add get_group_member_ids / get_room_member_ids(https://github.com/line/line-bot-sdk-python/pull/58)
* Add new API for Image Carousel(https://github.com/line/line-bot-sdk-python/pull/59)
* Add datetime picker action(https://github.com/line/line-bot-sdk-python/pull/61)
* Change 'postback.params' type from python object to dict.(https://github.com/line/line-bot-sdk-python/pull/64)

Bug fixes

* Fix super class to Template for CarouselTemplate.(https://github.com/line/line-bot-sdk-python/pull/56)

Trivial fixes

* Trivial fix. (https://github.com/line/line-bot-sdk-python/pull/57)
* Add sample code of 'image_carousel' and 'datetime picker postback'.(https://github.com/line/line-bot-sdk-python/pull/62)

* Add DeviceMessage property to BeaconEvent
* https://github.com/line/line-bot-sdk-python/pull/40
* https://github.com/line/line-bot-sdk-python/pull/41