update readme

README.md

@@ -1,11 +1,22 @@
 PyMigBench is a benchmark of Python Library Migrations. 
-This repository contains the library migration data and a tool to explore the data.
-Please visit [the PyMigBench website](https://ualberta-smr.github.io/PyMigBench) for detailed instructions on using the data and the tool. 
+This repository contains the data and code for the dataset.
 
-Contributors: [Mohayeminul Islam](https://mohayemin.github.io/), [Ajay Kumar Jha](https://hifromajay.github.io/), [Sarah Nadi](https://sarahnadi.org/) and [Ildar Akhmetov](https://ildarakhmetov.com/). 
-For any queries, please contact [email protected].
 
-If you are going to use this benchmark, please cite:
+## PyMigBench v2
+This is the latest version of the dataset.
+This includes all data from [PyMigBench v1](#pymigbench-v1) and additional migrations borrowed from the [SALM dataset](https://ieeexplore.ieee.org/document/10123560).
+The data also includes more information per migration-related code change.
+The dataset includes 3,096 migration-related code changes from 335 migrations between 141 analogous library pairs.
+The data and relevant code can be found in the [v2](/v2) directory of this repository.
+The paper is published published in FSE 2023.
+We will update the citation information once available.
+
+## PyMigBench v1
+The 2023 version of the dataset includes 375 migration-related code changes from 75 migrations between 34 analogous library pairs.
+The data and relevant code can be found in the [v1](/v1) directory of this repository.
+Please visit [the PyMigBench website](https://ualberta-smr.github.io/PyMigBench) for detailed instructions on using the dataset. 
+We recommend using [PyMigBench v2](#pymigbench-v2),
+however, if you are going to use this version, please cite the [MSR 2023 paper](https://ieeexplore.ieee.org/abstract/document/10174111):
 
 ```
 @INPROCEEDINGS{pymigbench,
@@ -18,5 +29,13 @@ If you are going to use this benchmark, please cite:
   pages={511-515},
   doi={10.1109/MSR59073.2023.00075}
 }
-
 ```
+
+
+## Contributors
+- [Mohayeminul Islam](https://mohayemin.github.io/)
+- [Ajay Kumar Jha](https://hifromajay.github.io/)
+- [Sarah Nadi](https://sarahnadi.org/)
+- [Ildar Akhmetov](https://ildarakhmetov.com/)  
+
+For any queries, please contact [email protected].