Add support for macOS 10.14

[ospfranco]

Hi! thanks a lot for the adapter, I'm working on a cross platform application using the newly released react-native-macos and rxdb, it seems the old adapter is now abandoned and full of bugs, so I needed support for macos, just adding it to the pod spec, seems to work!

[craftzdog]

Thanks. Can you preserve the code style?

[craftzdog]

Merged it anyway. Will format it later.

[craftzdog]

Oh, doesn't it have to unescape as well for macOS?

[ospfranco]

I'm not 100% sure, so far I haven't found any issues, however it probably also needs to be updated.

do you know what do I have to do to run this function?

[ospfranco]

I created #84, I will continue testing on my application but seems to be fine for now

[mouhsinelonly]

i have tested it on an app i am working on . eveyrthing is good until now.

[craftzdog]

You can test it with test/app.js.
The test tries to insert data with '\0' here: https://github.com/craftzdog/react-native-sqlite-2/blob/master/test/app.js#L185
It triggers escaping/unescaping data.
And you should see the result like this if it works as expected: