Add firemailbox.club, inboxkitten.com, tmpbox.net & more.. disposable domains (#271)

* Add firemailbox.club domain

* Add 3 more domains

* add wifimaple.com

* Add wifioak.com

* Add mail7.io and cnxingye.com

* drop a domain without proof

* clarify ruby paragraph

Co-authored-by: Adrien Rey-Jarthon <adrien.jarthon@ringcentral.com>
Co-authored-by: Martin Cech <cech.marten@gmail.com>

README.md

@@ -45,7 +45,8 @@ function isDisposableEmail($email, $blocklist_path = null) {
 ```
 **Ruby on Rails** contributed by [@MitsunChieh](https://github.com/MitsunChieh)
 
-In resource model, usually it is `user.rb`
+In the resource model, usually it is `user.rb`:
+
 ```Ruby
 before_validation :reject_email_blocklist
 
@@ -60,6 +61,9 @@ def reject_email_blocklist
   end
 end
 ```
+
+Alternatively you can use the `disposable_mail` gem: https://github.com/oesgalha/disposable_mail.
+
 **NodeJs** contributed by [@martin-fogelman](https://github.com/martin-fogelman)
 
 ```Node

disposable_email_blocklist.conf

@@ -1031,6 +1031,7 @@ filzmail.com
 findemail.info
 findu.pl
 fir.hk
+firemailbox.club
 fitnesrezink.ru
 fivemail.de
 fixmail.tk
@@ -1402,6 +1403,7 @@ inboxclean.org
 inboxdesign.me
 inboxed.im
 inboxed.pw
+inboxkitten.com
 inboxproxy.com
 inboxstore.me
 inclusiveprogress.com
@@ -1708,6 +1710,7 @@ mail2rss.org
 mail333.com
 mail4trash.com
 mail666.ru
+mail7.io
 mail707.com
 mail72.com
 mailapp.top
@@ -1910,6 +1913,7 @@ ml8.ca
 mm.my
 mm5.se
 mnode.me
+moakt.cc
 moakt.co
 moakt.com
 moakt.ws
@@ -2791,6 +2795,7 @@ tmail.com
 tmail.ws
 tmailinator.com
 tmails.net
+tmpbox.net
 tmpemails.com
 tmpeml.info
 tmpjr.me
@@ -3085,6 +3090,8 @@ wickmail.net
 widaryanto.info
 widget.gg
 wierie.tk
+wifimaple.com
+wifioak.com
 wikidocuslava.ru
 wilemail.com
 willhackforfood.biz