Implement the interface

Author: paragonie-security

src/OTP/HOTP.php

@@ -11,7 +11,7 @@
  * Class HOTP
  * @package ParagonIE\MultiFactor\OTP
  */
-class HOTP
+class HOTP implements OTPInterface
 {
     /**
      * @var string

src/OTP/TOTP.php

@@ -11,7 +11,7 @@
  * Class TOTP
  * @package ParagonIE\MultiFactor\OTP
  */
-class TOTP
+class TOTP implements OTPInterface
 {
     /**
      * @var string