Update readme for release 0.4.2 (#805)
Update readme for release 0.4.2 (#805)

* Removed references to PEAR package manager. We now only use composer package manager

* Added info for Service Bus connection strings

* Change require microsoft to ^0.4
* Removed minimum stability as dev
* Added requirement for php 5.5+ as a note in the Media Services section

southworkscom/azure-sdk-for-php,Azure/azure-sdk-for-php