Target pengwynn/pingwynn for stats specs

Octokit.rb has a rather large dataset, more than we need for testing so
I pointed the ion cannon at pengwynn/pingwynn to satisfy the Stats
specs.
Fix client secret filter for cassette recording
Merge pull request #410 from joeyw/target-pingwynn-for-stats-specs

Target pengwynn/pingwynn for stats specs
Merge pull request #411 from joeyw/fix-vcr-client-secret-filter

Fix client secret filter for cassette recording
Deprecate positional state argument for Client#pull_requests

/cc @arfon @pjhyett
Merge pull request #412 from octokit/handle-pull-request-state-for-listing

Deprecate positional state argument for Client#pull_requests
Correct docstring for state param for listing issues

Fixes #408