chore(deps): bump github.com/hashicorp/go-retryablehttp from 0.6.4 to 0.6.8

Created by: dependabot[bot]

Bumps github.com/hashicorp/go-retryablehttp from 0.6.4 to 0.6.8.

Commits

• 991b9d0 Align ErrorPropagatedRetryPolicy with DefaultRetryPolicy (#116)
• 6861976 We now need Go 1.13. (#107)
• 37b3e74 Merge pull request #105 from hashicorp/fix-request-body-data-race
• 0321369 Try to fix #94 by eliminating the contention with a new struct copy.
• 1831df7 Added support for HTTP 429 Retry-After as per Issue #99 (#100)
• cf855b1 LeveledLogger: Add doc and prioritize it over Logger (#97)
• 171d0c9 Propogate Do() HTTP error up when retries are exceeded (#70)
• 7cf40fa Fix errors from original http.Client response being double-wrapped when using...
• 4af2e4b Prevent race during Client.HTTPClient initialization. (#92)
• fa421e5 Migrate from Travis to Circle
• Additional commits viewable in compare view

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