Caption v1.2.0

This version supports multiple subtitles sources! 🎉 For more information check #7.

• Opensubtitles.org
• Addic7ed.com

Improvements

• Multiple subtitle sources #7
• Add opensubtitles.org references #14

Fixes

• Transparent background on non-vibrancy os versions #24
• Remember answer to "move to app folder" #21
• Add a link to website/github in the About page #18
• Include screenshot in readme #17