Rename method in the readme

Author: ssfinney

readme.md

@@ -32,6 +32,7 @@ You mixin the assertions with the ```Spinen\MailAssertions\MailTracking``` trait
 * seeEmailBcc
 * seeEmailCc
 * seeEmailContains
+* seeEmailCountEquals
 * seeEmailDoesNotContain
 * seeEmailEquals
 * seeEmailFrom
@@ -42,7 +43,6 @@ You mixin the assertions with the ```Spinen\MailAssertions\MailTracking``` trait
 * seeEmailTo
 * seeEmailWasNotSent
 * seeEmailWasSent
-* seeEmailsSent
 
 NOTE: If there was more than 1 email sent, then the assertions look at the last email.