Update astropy requirement in setup.py.

adc66885 · Alessio Berti · 06ad6a49 · adc66885
Commit adc66885 authored Dec 05, 2021 by Alessio Berti
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ setup(
    packages=find_packages(),
    install_requires=[
        'ctapipe~=0.12.0',
-        'astropy~=4.2',
+        'astropy>=4.0.5,<5',
        'uproot~=4.0',
        'numpy',
        'scipy'