https://github.com/YoKeyword/IndexableRecyclerView/pull/53
https://github.com/YoKeyword/IndexableRecyclerView/pull/51
https://github.com/YoKeyword/IndexableRecyclerView/pull/50
https://github.com/YoKeyword/IndexableRecyclerView/pull/48
https://github.com/YoKeyword/IndexableRecyclerView/pull/46
https://github.com/YoKeyword/IndexableRecyclerView/pull/42
https://github.com/YoKeyword/IndexableRecyclerView/pull/11
