subscriber: add space when recording new values on an existing span#659

Merged

hawkw merged 2 commits intotokio-rs:masterfrom bnjjj:master

Apr 2, 2020

+3

Commits on Apr 2, 2020

fix(FmtSubscriber): add space between multiple values for same key in a span tokio-rs#627
bnjjj
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Merge branch 'master' of github.com:bnjjj/tracing
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