Added:

1. Add constructor options:
  * (#243) `options.polling.params` (by @GochoMugo, requested-by @sidelux)
1. Add methods:
  * (#74) *TelegramBot#removeReplyListener()* (by @githugger)
1. (#283) Add proper error handling (by @GochoMugo)
1. (#272) Add health-check endpoint (by @mironov)
  * `options.webHook.healthEndpoint`
1. (#152) Add test for TelegramBot#sendDocument() using 'fileOpts'
   param (by @evolun)
1. Document `options.webHook.host` (by @GochoMugo)
1. (#264) Add Bot API version to README (by @kamikazechaser)
1. Add examples:
  - (#271) WebHook on Heroku (by @TheBeastOfCaerbannog)
  - (#274) WebHook on Zeit Now (by @ferrari)

Changed:

1. (#147) Use *String#indexOf()*, instead of *RegExp#test()*, to
   find token in webhook request (by @AVVS)

Fixed:

* Fix bug:
  - (#275, #280) fix es6 syntax error on Node.js v4.x (by @CrazyAbdul)
  - (#276) promise.warning from `request-promise` (by @GochoMugo,
    reported-by @preco21)
  - (#281) fix handling error during polling (by @GochoMugo,
    reported-by @dimawebmaker)
  - (#284) fix error during deletion of already-set webhook, during
    polling (by @GochoMugo, reported-by @dcparga)
1. Fix links in documentation (by @Ni2c2k)