Whitelist Gravity Forms, resolves #85.

Author: octalmage

src/wpephpcompat.php

@@ -76,6 +76,7 @@ class WPEPHPCompat {
 		'*/myMail/*' => '7.0',
 		'*/wp-spamshield/*' => '7.0',
 		'*/vendor/stripe/stripe-php/lib/StripeObject.php' => '7.0', // https://github.com/wpengine/phpcompat/issues/89
+		'*/gravityforms/*' => '7.0', // https://github.com/wpengine/phpcompat/issues/85
 	);
 
 	/**