Renamed two test files

diff --git a/t/pod.t b/t/998_pod.t
similarity index 100%
rename from t/pod.t
rename to t/998_pod.t

diff --git a/t/pod_coverage.t b/t/999_pod_coverage.t
similarity index 100%
rename from t/pod_coverage.t
rename to t/999_pod_coverage.t