Update README.md

Author: yutakang

README.md

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 - We updated this repository to Isabelle2021-1.
 - LiFtEr and Smart_Induct are no-longer supported, since their successors, SeLFiE and sem_ind, have shown superior performance.
 - This is the development version of PSL, PaMpeR, SeLFiE, and sem_ind where we try out possibly immature ideas. In case you find problems, please send your feedback.
-- The main developer of this repository, Yutaka Ng, has taken a full-time position for the [SuSLik](https://github.com/TyGuS/suslik) project at Yale-NUS, and he will work on [PSL and all that](https://github.com/data61/PSL/) only in his spare time. Therefore, the progress of this project, unfortunately, will be slow for the foreseeable future. In case you find problems and requests about data61/PSL, contact Yutaka Ng (email: yutaka.nagashima@student.uibk.ac.at, twitter: [YutakangE](https://twitter.com/YutakangE)).
+- The main developer of this repository, Yutaka, has taken a full-time position for at a private company, and he works on [PSL and all that](https://github.com/data61/PSL/) only in his spare time. Therefore, the progress of this project, unfortunately, will be slow for the foreseeable future. In case you find problems and requests about data61/PSL, contact Yutaka (email: united.reasoning+gmail.com (reaplace + with @), twitter: [YutakangE](https://twitter.com/YutakangE)) or open an issue.
 
 # Smart_Isabelle