Turn install requires into minimal requirements, with no pinned versi…

…ons.

setup.py

@@ -83,8 +83,8 @@
     # your project is installed. For an analysis of "install_requires" vs pip's
     # requirements files see:
     # https://packaging.python.org/en/latest/requirements.html
-    install_requires=requirements,
     #install_requires=requirements,
+    install_requires=["numpy", "scipy", "astropy", "pyastronomy", "matplotlib",],
     setup_requires=['pytest-runner'],
     tests_require=['pytest', "hypothesis", "pytest-cov"],
     # List additional groups of dependencies here (e.g. development