Update EmailConverter.kt

Author: jakobkmar

simplekotlinmail-core/src/jvmMain/kotlin/net/axay/simplekotlinmail/email/EmailConverter.kt

@@ -13,3 +13,8 @@ val MimeMessage.email: Email get() = EmailConverter.mimeMessageToEmail(this)
  * Convert this Email instance to a MimeMessage
  */
 val Email.mimeMessage: MimeMessage get() = EmailConverter.emailToMimeMessage(this)
+
+/**
+ * Convert this string to an Email instance.
+ */
+fun String.toEmail(): Email = EmailConverter.emlToEmail(this)