Indicate supported for laravel 5.5 and above

Some people may have doubts that is only 5.5 exclusive feature and later version of laravel doesn't support it

Added laravel 5.7 support

Added laravel 5.7 support

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