Log Message:
Update to 1.31

Upstream changes:
1.31	- 2017-06-13, H.Merijn Brand
    * Fix already decoded BOM in headers
    * New options in csv-check
    * Some perlcritic
    * "escape" is alias for "escape_char" for consistency.
    * Code cleanup and more tests (Devel::Cover)
    * Improve csv-check auto-sep-detection

1.30	- 2017-06-08, H.Merijn Brand
    * Add csv (..., out => ...) syntax examples (issue 7)
    * Disable escape_null for undefined escape_char
    * Fix ->say for bound columns (RT#121576)
    * Update to Devel::PPPort 3.36
    * Tested under 5.26.0 and 5.27.0
    * Doc changes and additions