Fix the windows blogpost date.

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MOS_MIGRATED_REVID=137128701
diff --git a/site/blog/_posts/2016-09-07-bazel-windows.md b/site/blog/_posts/2016-10-07-bazel-windows.md
similarity index 100%
rename from site/blog/_posts/2016-09-07-bazel-windows.md
rename to site/blog/_posts/2016-10-07-bazel-windows.md