Fix test

Author: nicolas-grekas

Tests/Inflector/EnglishInflectorTest.php

@@ -58,7 +58,7 @@ public function singularizeProvider()
             ['crises', ['cris', 'crise', 'crisis']],
             ['criteria', ['criterion', 'criterium']],
             ['cups', 'cup'],
-            ['coupon', 'coupons'],
+            ['coupons', 'coupon'],
             ['data', 'data'],
             ['days', 'day'],
             ['discos', 'disco'],
@@ -202,6 +202,7 @@ public function pluralizeProvider()
             ['crisis', 'crises'],
             ['criteria', 'criterion'],
             ['cup', 'cups'],
+            ['coupon', 'coupons'],
             ['data', 'data'],
             ['day', 'days'],
             ['disco', 'discos'],