Feature/invisible recaptcha challenge button

for laravel 5.6

config file publishing instructions

Allow verifying multiple times.

Testing, use for HTTP tests

Directions on how to create HTTP tests and pass the required rule

Google will only verify a response one time .. so we cache the response to allow multiple calls to verifyResponse() method.

Update READMME.md

- add badges
- fix errors
- add validation message doc
- add more info

Make tests pass

Explicit rendering after an onload callback

Custom guzzle options

update composer packages to match laravel 5.5 requirements

Support Auto-Discovery

Delete square brackets in params

update doc

Support for Laravel 5.4

* Update for multiple app('captcha')->display() on the same page

registerin the service provider with singleton instead of bind will return always the same object per page load. with this methos is possible to insert a control variable in the class and use it to 

* Upda for multiple noCaptcha on the same page

ading this var control will permit to request the api only once. this will work with the singleton register on te serviceprovider file.

* Update NoCaptcha.php

* Update NoCaptcha.php

implement Guzzle usage.