Readme tweak

README.md

@@ -158,7 +158,7 @@ These derived images include a set of standard capabilities that enable many of
 - MySQL Client 14.14
 - .NET Core SDK 2.1.101 (runtime 2.0.6)
 - Node.js 8.11.2 LTS
-- PHP 5.6, 7.0, 7.1, 7.2 with composer and phpunit
+- PHP 5.6, 7.0, 7.1, and 7.2, with composer and phpunit
 - Powershell Core v6.1.0-preview.2
 - Python 2.7.14, 3.3.7, 3.4.8, 3.5.5, 3.6.4 and 3.7.0-b2 (from hosted tools cache)
 - Ruby 2.3.7, 2.4.4 and 2.5.1 (from hosted tools cache)