\Facebook\InstantArticles\Transformer\Transformer::transform() is deprecated in FBIA PHP SDK ~1.8.3

Problem/Motivation

\Facebook\InstantArticles\Transformer\Transformer::transform() is deprecated in favour of \Facebook\InstantArticles\Transformer\Transformer::transformString(). We should make that change in our transformer usage.

Proposed resolution

Change our code anywhere where we use \Facebook\InstantArticles\Transformer\Transformer::transform() to use \Facebook\InstantArticles\Transformer\Transformer::transformString().

Remaining tasks

Implement.

User interface changes

None.

API changes

None.

Data model changes

None.