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AddingPowerSupport_CI/Testing (#234)

Revert "Support Go 1.13 error chains in `Cause` (#215)" (#220)

Support Go 1.13 error chains in `Cause` (#215)

remove unnecessary use of fmt.Sprintf (#217)

feat: support std errors functions (#213)

Add support for Go 1.13 error chains (#206)

travis.yml: add Go 1.13

fix travis, 1.10 doesnt support by unconvert anymore

travis.yml: add Go 1.12 (#200)

Add json.Marshaler support to the Frame type. (#197)

Reduce allocations in StackTrace.Format (#194)

Merge pull request #193 from pkg/fixedbugs/188

Restore performance improvements from #150

Return errors.Frame to a uintptr