v1.3.18 - fixed video downloads on post pages (RIP graphql)

graphql calls are gone and i had to change my strategy for obtaining video urls.
it wasn't too hard to find the urls again. the dom was kind to me in this regard.
the difficult part was in determining which video belongs to which item in a carousel.

please check the quality of your downloaded videos. i can't say if they are always good quality.
also please verify that it's the correct video from the carousel. my method for determining the video index is not pretty.

for more information, please see #41.

something is telling me we're gonna see each other very soon.