Update annotate-snippets-rs to 0.8.0#72026

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bors merged 3 commits intorust-lang:masterfrom

zzau13:master

Jun 8, 2020

Commits on May 8, 2020

Update annotate-snippets-rs to 0.8.0
zzau13
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Commits on May 9, 2020

Add UI test where `annotated_files` count is > 1 #64205
zzau13
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Commits on May 16, 2020

Fix make sure out primary file comes first
zzau13
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