docs: update roadmap

Author: dmitryusenko

README.md

@@ -257,6 +257,7 @@ const ownsTheCar = await classifier.predict([0.2, 0.76, 0]);
 - [x] Binary classification ([#1](https://github.com/RonasIT/tfjs-node-helpers/pull/1))
 - [x] Asynchronously loaded datasets ([#14](https://github.com/RonasIT/tfjs-node-helpers/issues/14))
 - [x] Feature normalization ([#5](https://github.com/RonasIT/tfjs-node-helpers/issues/5))
+- [x] Custom metrics ([#18](https://github.com/RonasIT/tfjs-node-helpers/issues/18))
 - [ ] Add an example of queued feature extraction and evaluation ([#12](https://github.com/RonasIT/tfjs-node-helpers/issues/12))
 - [ ] Add an example of storing the extracted features ([#13](https://github.com/RonasIT/tfjs-node-helpers/issues/13))
 - [ ] Categorical features ([#19](https://github.com/RonasIT/tfjs-node-helpers/issues/19))
@@ -266,7 +267,6 @@ const ownsTheCar = await classifier.predict([0.2, 0.76, 0]);
 - [ ] Uncertainty ([#15](https://github.com/RonasIT/tfjs-node-helpers/issues/15))
 - [ ] Handle class imbalance problem ([#10](https://github.com/RonasIT/tfjs-node-helpers/issues/10))
 - [ ] Add more metrics ([#17](https://github.com/RonasIT/tfjs-node-helpers/issues/17))
-- [x] Custom metrics ([#18](https://github.com/RonasIT/tfjs-node-helpers/issues/18))
 - [ ] Automated tests ([#6](https://github.com/RonasIT/tfjs-node-helpers/issues/6))
 - [ ] Continuous Integration ([#11](https://github.com/RonasIT/tfjs-node-helpers/issues/11))
 - [ ] Add more examples ([#8](https://github.com/RonasIT/tfjs-node-helpers/issues/8))