README fixes

Author: overint

README.md

@@ -1,11 +1,13 @@
 # php-mailgun-validation
 Validate email address with Mailgun's validation service (Syntax checks, DNS validation, MX validation)  
-You can view Mailgun's blog post about the service here: http://blog.mailgun.com/free-email-validation-api-for-web-forms/
-An API key is required to use this library, it can be obtained for free from mailgun's site after signup:
+You can view Mailgun's blog post about the service here: http://blog.mailgun.com/free-email-validation-api-for-web-forms/  
+An API key is required to use this library, it can be obtained for free from mailgun's site after signup:  
 https://mailgun.com/app/account/security
 
 The service is free, however fair usage limits do apply (detailed in the post linked above).
 
+Installing using Composer
+---------
 You can install this package using composer:
 
     composer require overint/php-mailgun-validation