Make it work with newer v8 versions

[ayles]

I'm using v8pp with V8 7.7.214, and there is following problems:

convert.hpp line 182:

return value->BooleanValue(isolate->GetCurrentContext()).FromJust();

should be changed to

return value->BooleanValue(isolate);

throw_ex.ipp lines 7 and 13 - .ToLocalChecked() needed.

So it will be cool to add some #if's on V8 version to fix this.
I'm not so deep into V8 and it's change history so I can't do it right =)

[pmed]

Hi,

Thanks for the reporting. Yes, that deprecated BooleanValue() overload was removed in V8 7.6 version. I have definitely to fix this.

Duplicates: #117

[pmed]

Fixed by @jacobsologub in PR #123