Adding a new snapshot.

[silviapfeiffer]

@tmichel07 this is in preparation for CR - let me know what changes you need made to the Overview.html document, which is the one we would upload to the W3C CVS repository.

[silviapfeiffer]

You can inspect the specification at https://htmlpreview.github.io/?https://github.com/silviapfeiffer/webvtt-spec/blob/e3a5a77f462594c341419e5008d7d5940025cdfc/archives/2018-04-15/Overview.html

[silviapfeiffer]

If you're curious to inspect:

Diff is at https://htmlpreview.github.io/?https://raw.githubusercontent.com/silviapfeiffer/webvtt-spec/e3a5a77f462594c341419e5008d7d5940025cdfc/archives/2018-04-15/diff.html

Changes is at https://htmlpreview.github.io/?https://raw.githubusercontent.com/silviapfeiffer/webvtt-spec/e3a5a77f462594c341419e5008d7d5940025cdfc/archives/2018-04-15/changes.html

[dwsinger]

Some spell checking needed, for example:

Diff from previsou Workdin Draft WebVTT.

[silviapfeiffer]

I already fixed that. Anything else you saw?