setup: require nmigen>=0.1,<0.3.

Author: emilazy

setup.py

@@ -23,7 +23,7 @@ def local_scheme(version):
     #long_description="""TODO""",
     license="BSD",
     setup_requires=["setuptools_scm"],
-    install_requires=["nmigen~=0.1.rc1"],
+    install_requires=["nmigen>=0.1,<0.3"],
     packages=find_packages(),
     project_urls={
         "Source Code": "https://github.com/m-labs/nmigen-soc",