eth/downloader: more context in errors (#21067)
This PR makes use of go 1.13 error handling, wrapping errors and using errors.Is to check a wrapped root-cause. It also removes the travis builders for go 1.11 and go 1.12.
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- .travis.yml 0 additions, 20 deletions.travis.yml
- eth/downloader/downloader.go 25 additions, 10 deletionseth/downloader/downloader.go
- eth/downloader/downloader_test.go 16 additions, 11 deletionseth/downloader/downloader_test.go
- eth/downloader/queue.go 8 additions, 6 deletionseth/downloader/queue.go
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