Removed references to phar, and fixed minimum requires in README

Author: dragonmantank

README.md

@@ -25,14 +25,6 @@ command line:
 $ ./composer.phar require opentok/opentok 4.4.x
 ```
 
-### Manually:
-
-Download the `opentok.phar` file for the latest release from the [Releases](https://github.com/opentok/opentok-php-sdk/releases)
-page.
-
-Place `opentok.phar` in the [include_path](http://www.php.net/manual/en/ini.core.php#ini.include-path) OR
-require it in any script which uses the `OpenTok\*` classes.
-
 ## Usage
 
 ### Initializing
@@ -514,9 +506,7 @@ Reference documentation is available at
 You need an OpenTok API key and API secret, which you can obtain by logging into your
 [TokBox account](https://tokbox.com/account).
 
-The OpenTok PHP SDK requires PHP 5.6+ or PHP 7+
-
-For PHP 5.5 and lower please use PHP SDK v2.5
+The OpenTok PHP SDK requires PHP 7.2 or higher.
 
 ## Release Notes