v0.16.0

Changelog

• 047e929 Add feature to download mp4 videos or gifs from subreddit (#1103)
• 33a669f Add vk extractor. (#1125)
• 9b649c3 Bump kkdai/youtube version to v2.7.13
• 48b1e69 Fix Fs parse failed while video length is too long
• eaf65b9 Treats vimeoProgressive.request.files.progressive.profile as type string
• d1e42aa Update Youku ccode
• 0b3198d Use pandora as utils library
• d57edc7 fix: replace ioutil functions with recommended ones
• 69d3e64 fix: youtube downloader with proxy (#1162)