change CameraOptions of README.md in ios

[ferretdayo]

Platforms affected

iOS

What does this PR do?

it modified on README.md.
it may be wrong.

In README.md

• allowEdit is true on default in CameraOptions.

but, actually allowEdit default value is false.
In a part of www/Camera.js

cameraExport.getPicture = function(successCallback, errorCallback, options) {
    options = options || {};

    var allowEdit = !!options.allowEdit;    // if do not set value, this allowEdit is false
};

What testing has been done on this change?

Checklist

• Reported an issue in the JIRA database
• Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
• Added automated test coverage as appropriate for this change.

[cordova-qa]

Cordova CI Build has completed successfully.

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316 tests run, 28 skipped, 0 failed.

[jcesarmobile]

Thanks for the PR.
Next time please, create an issue on JIRA even if the change is small.