* Added backers and sponsors on the README

* Added call to donate after npm install (optional)

* add example code

* Make the piece of code in the bracket

* add send urlLink example code in room class

* make the example more specific and meaningful

* 0.25.5

* remove chinese character

* make the example more specific and meaningful

* change indnetation to be two spaces

* add impl for recalled on Message

* 0.25.3

* refactor test to make code climate happy

* Revert "refactor test to make code climate happy"

This reverts commit 1f95756a.

* revise code according to review and add example code for toRecalled()

* move code inside try block

* revise room.say() mention function

* add test for new mention func

* more change according to review

* make sub tests independent from each other

* bump package version

* add tagged template code example for room.say()