bump version [skip ci]

Author: takenori-y

README.md

@@ -3,7 +3,7 @@
 *diffsptk* is a differentiable version of [SPTK](https://github.com/sp-nitech/SPTK) based on the PyTorch framework.
 
 [![Latest Manual](https://img.shields.io/badge/docs-latest-blue.svg)](https://sp-nitech.github.io/diffsptk/latest/)
-[![Stable Manual](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/diffsptk/2.1.0/)
+[![Stable Manual](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/diffsptk/2.1.1/)
 [![Downloads](https://static.pepy.tech/badge/diffsptk)](https://pepy.tech/project/diffsptk)
 [![Python Version](https://img.shields.io/pypi/pyversions/diffsptk.svg)](https://pypi.python.org/pypi/diffsptk)
 [![PyTorch Version](https://img.shields.io/badge/pytorch-1.12.0%20%7C%202.3.1-orange.svg)](https://pypi.python.org/pypi/diffsptk)

diffsptk/version.py

@@ -1 +1 @@
-__version__ = "2.1.0"
+__version__ = "2.1.1"