logger: make LvlFromString slightly more flexible

inconshreveable / log15

Structured, composable logging for Go

https://godoc.org/github.com/inconshreveable/log15

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logger: make LvlFromString slightly more flexible #158

Closed kevinburke closed 4 years ago

kevinburke commented 4 years ago

Also return the correct level for "WARN", "Warn" etc. While we are at it, lowercase the returned error string - staticcheck among others warns about uppercased error messages.