Update README.md

Author: MailboxValidator

README.md

@@ -24,7 +24,7 @@ Dependencies
 
 An API key is required for this class to function.
 
-Go to http://www.mailboxvalidator.com/plans#api to sign up for a FREE API plan and you'll be given an API key.
+Go to https://www.mailboxvalidator.com/plans#api to sign up for a FREE API plan and you'll be given an API key.
 
 Usage
 =====
@@ -217,4 +217,4 @@ Errors
 Copyright
 =========
 
-Copyright (C) 2017 by MailboxValidator.com, [email protected]
+Copyright (C) 2018 by MailboxValidator.com, [email protected]