Add all author emails, fix satellogic#12

See pypa/packaging-problems#143

Author: astrojuanlu

setup.py

@@ -7,7 +7,7 @@
     name='satellogic_quaternions',
     version=versioneer.get_version(),
     author='Matias Graña, Enrique Toomey, Slava Kerner, Juan Luis Cano',
-    author_email='[email protected]',
+    author_email='[email protected], [email protected], [email protected], [email protected]',
     description='This is a library for dealing with quaternions in Python in a unified way.',
     url="https://github.com/satellogic/quaternions/",
     long_description=open('README.md').read(),