* Change Unknown to Yes for Mixcloud CORS column

Hi! I'd like to suggest Merriam-Webster's dictionary and thesaurus APIs. These are free for non-commercial use, up to 1,000 requests per day: https://dictionaryapi.com/

Updated Transport for Boston, US with a working URL.

* Add Pusher's Beam Api

* Update formatting of Pusher Beam

Update Eve Online URL

Add IBM Text to Speech API

Updated CONTRIBUTING.md

The Text to Speech service processes text and natural language to generate synthesized audio output complete with appropriate cadence and intonation.
More info on https://console.bluemix.net/catalog/services/text-to-speech

Remove Kairos Api

Kairos remove free plan

Added SoundCloud API

Update README.md

Typo fix

Removed Certly

Updated Clearbit Logo auth

Reason: Website does not work anymore

* Adding CalendarIndex Holidays API

* Removing . from the end of the description

* Remove "API" from Description

Fix casing of GitHub "h"

This is a nitpicking thing but GitHub is spelled with a capital H.

* Add Nager.Date Public holiday project with api

* Update README.md

Closes #758