Update version in setup.py to 0.2.0 (#164)

## Summary
<!--- This is a required section; please describe the main purpose of
this proposed code change. --->
New release with features should bump minor version tehe
<!---
## Details
This is an optional section; is there anything specific that reviewers
should be aware of?
--->

## Testing Done
<!--- This is a required section; please describe how this change was
tested. --->

<!-- 
Replace BLANK with your device type. For example, A100-80G-PCIe

Complete the following tasks before sending your PR, and replace `[ ]`
with
`[x]` to indicate you have done them. 
-->

- Hardware Type: <BLANK>
- [ ] run `make test` to ensure correctness
- [ ] run `make checkstyle` to ensure code style
- [ ] run `make test-convergence` to ensure convergence

Author: yundai424

setup.py

@@ -1,6 +1,6 @@
 from setuptools import find_namespace_packages, setup
 
-__version__ = "0.1.2"
+__version__ = "0.2.0"
 
 setup(
     name="liger_kernel",