Release version v0.4.0

What's changed

• Use ffmpeg by command line & add fade in/out effect.
• Update Modeling & Interest Calculation
• Enable making shorts with Youtube URL
• UI Change
• Some bug fix

Changed issue

• [Feat] laughter timeline bug fix by @Shimjoonkyo in #75
• [Feat] Update face_function.py by @sooya233 in #76
• [Feat] Modify ffmpeg code to command line and add fade effect by @seungriyou in #80
• [Feat] Add APIs using Youtube URL by @seungriyou in #81
• [Feat] Add Youtube URL feature to UploadVideo by @seungriyou in #82
• [Feat] Modify api codes for multi-request by @seungriyou in #83
• [Feat] Modify frontend by @seungriyou in #84
• [Feat] Change code for making timelines by @Shimjoonkyo in #86

Full Changelog: v0.3.0...v0.4.0