Usage of arrow functions breaks functionality on <ios 10

[devsaider]

Bug description

Usage of arrow functions in recaptcha.html breaks iOS 9 support because safari in iOS 9 doesn't support arrow functions in js and maybe something else.
https://caniuse.com/#feat=arrow-functions

To Reproduce

Steps to reproduce the behavior:

1. Run example app (v1.5.0) on any simulator with <ios 10 (ex. iOS 9)

Expected behavior

recaptcha.validate() method to work or didFinishLoading callback

Additional context

It also works if I use recaptcha.html from older version (e.g. 1.4.2)

[fjcaetano]

Good catch. Do you think you could work on a PR for this?

[fjcaetano]

@devsaider I just opened PR #80 with a possible fix.

Could you point your Podfile to the branch fix/arrow-func and check if that fixed your issue?