3.1.8 X-Feature-Flags

I did a fix on the code that adds custom headers to the i/tv page in the x web app.

What's Changed

• Feat/headers tv by @lohansimpson in #13
• Feat/headers tv-merge 3.1.7 by @lohansimpson in #14
• feat / made headers work on i/tv instead of all x.com domain by @lohansimpson in #16

Full Changelog: Prod...Production