Please update alpine to 3.8

[ILOVEPIE]

Please update alpine to 3.8 there are some packages that are necessary for a video editing container I'm working on based on your ffmpeg container.

[jrottenberg]

(IDOTOO)

Hello !

Do you want to give it a try ? see https://github.com/jrottenberg/ffmpeg/blob/master/templates/Dockerfile-template.alpine#L7

• Start a branch
• update alpine tag
• run ./update.py to regenerate the Dcokerfile of all the alpine based versions
• push
• make a pr
• Travis will tell you if all ffmpeg versions compile properly

[jidckii]

/close