Version Bump to 1.5.0

* Update the CHANGELOG
* Update the README

Update the Podspec for the 1.5.0-rc.1

Merge pull request #415 from Vkt0r/1.4.7

Release 1.4.7

Merge pull request #373 from httpswift/1.4.6

Bump version to 1.4.6 for Swift 5

Change version to 1.4.3

Merge pull request #317 from oliveroneill/server-start-bug

Fix bug where server may fail to start

Change version to 1.4.1.

Swift 4