Update CHANGELOG.md

CHANGELOG.md

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 ### New features
 
+* `TFRecordData`: A new data module for reading and processing TFRecord data, with support for, e.g., image data, feature data, etc. ([#107](https://github.com/asyml/texar/pull/107))
 * `GPT-2`: OpenAI pretrained language model. ([#91](https://github.com/asyml/texar/pull/91), [example](https://github.com/asyml/texar/tree/master/examples/gpt-2))
 * `TopKSampleEmbeddingHelper` to perform top_k random sample decoding. ([baa09ff](https://github.com/asyml/texar/commit/baa09ff0ec898996d7be2535e73bedd1e92c1fb2))
 
 ### Feature improvements
 
+* Refactor [`BERT` example](https://github.com/asyml/texar/tree/master/examples/bert) using `TFRecordData` data module. 
 * `TransformerDecoder` supports `helper` arguments to specify decoding strategy. ([#76](https://github.com/asyml/texar/pull/76))
 
 ### Fixes
 
+* Fix variable collection bug in [`examples/seqgan`](https://github.com/asyml/texar/tree/master/examples/seqgan). ([#110](https://github.com/asyml/texar/pull/110))
 * Fix error when `beam_search_decode` with `output_layer=tf.identity` ([#77](https://github.com/asyml/texar/pull/77))
 * Fix readthedocs compilation error ([#85](https://github.com/asyml/texar/pull/85))