latest version of retryablehttp.RequestLogHook change callback signature to use new interface

[peczenyj]

on this commit, go-retryablehttp change some types to use new interfaces

hashicorp/go-retryablehttp@f976417

$ go test -v ./...
# github.com/circonus-labs/circonus-gometrics
./submit.go:144:24: cannot use func literal (type func(*log.Logger, *http.Request, int)) as type retryablehttp.RequestLogHook in assignment

so it is easy to fix via change the type of the first argument

[cgbaker]

Just ran into this as well after needing to update to a later hashicorp/go-retryablehttp.

[maier]

@cgbaker which branch are you using v2 or v3? If you are using master, please use either the v2 (dep) or v3 (go modules) branch.