Update install.md

docs/install.md

@@ -8,10 +8,8 @@
   - [CLI](#cli)
   - [Python API](#python-api)
 
-
-
 ### Linux Install
-Use pip to install from github repo.
+The repo is developed and tested on `Ubuntu 20.04` and `Python 3.9`. Use pip to install from github repo.
 ```bash
 pip install git+https://github.com/myshell-ai/MeloTTS.git
 python -m unidic download
@@ -231,4 +229,4 @@ speaker_ids = model.hps.data.spk2id
 
 output_path = 'kr.wav'
 model.tts_to_file(text, speaker_ids['KR'], output_path, speed=speed)
-```
+```