Update CHANGELOG.md

CHANGELOG.md

@@ -10,12 +10,20 @@
 
 ### New features
 
-* Support only Python 3.6 and 3.7. Drop support of older Python versions.
+* Support only Python 3.6 and 3.7. Drop support of older Python versions. ([#211](https://github.com/asyml/texar/pull/211))
+* Add Tokenizers including tokenizers for pretrained models (`BERTTokenizer`, `XLNetTokenizer`, etc). ([#225](https://github.com/asyml/texar/pull/225))
+* Add GPT2 modules (`GPT2Encoder`, `GPT2Decoder`, `GPT2Classifier`, etc). ([#228](https://github.com/asyml/texar/pull/228))
 
 ### Feature improvements
 
+* Update embedder modules `dropout_strategy=='item'` to support TensorFlow v1.15. ([#231](https://github.com/asyml/texar/pull/231))
+* Update `.gitignore` and add `.gitignore` files to all examples. ([#233](https://github.com/asyml/texar/pull/233)) 
+* Polish code style according to flake8. ([#234](https://github.com/asyml/texar/pull/234))
+* Add GPT2 XL pretrained checkpoint. ([#243](https://github.com/asyml/texar/pull/243))
+
 ### Fixes
 
+* Fix `examples/transformer/scripts/wmt14_en_de.sh` to create output dir automatically. ([#238](https://github.com/asyml/texar/pull/238))
 * Fix variable scope issue in `texar.tf.modules.decoders.dynamic_decode`. ([#246](https://github.com/asyml/texar/pull/246))
 
 ## [v0.2.3](https://github.com/asyml/texar/releases/tag/v0.2.3) (2019-09-22)