Release 1.1.0

What's Changed

• multiband periodogram by @ignacioreyes in #1
• Frequency grid by @ignacioreyes in #2
• Travis checks OSX by @ignacioreyes in #3

New Contributors

• @ignacioreyes made their first contribution in #1

Full Changelog: https://github.com/alercebroker/P4J/commits/1.2.0