update version to v0.2.0

Author: zhengp0

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "mrtool"
-version = "0.1.4"
+version = "0.2.0"
 description = "Featured nonlinear mixed effects model"
 readme = "README.rst"
 requires-python = ">=3.10"
@@ -19,4 +19,4 @@ dev = ["pytest", "pytest-mock"]
 doc = ["sphinx", "sphinx-autodoc-typehints", "furo"]
 
 [project.urls]
-github = "https://github.com/ihmeuw-msca/mrtool"
+github = "https://github.com/ihmeuw-msca/mrtool"