Merge pull request #121 from mattu08/master

Update free-science-books.md
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* [Astronomy (1915)](https://unglue.it/work/81943/) - Harold Jacoby
* [Astronomy (OpenStax)](https://openstax.org/details/books/astronomy) - Andrew Fraknoi et al. (PDF)
* [Astronomy 2e (OpenStax)](https://openstax.org/details/books/astronomy-2e) - Andrew Fraknoi et al. (PDF)
* [Astronomy of To-day: A Popular Introduction in Non-Technical Language (2009)](https://unglue.it/work/81958/) - Cecil Goodrich Julius Dolmage
* [Elements of astronomy (1836)](https://unglue.it/work/81958/) - John Hubbard Wilkins
* [Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope (2015)](https://unglue.it/work/145858/) - Dylan Steele