better error message when loading xls files (#52)

encrypted xlsx files use the same file container format as xls files,
and so our simple heuristic here will identify xls files as encrypted
xlsx files - we should bail out if we can't find encrypted data instead

1 files changed, 1 insertions, 0 deletions

diff --git a/Changes b/Changes
index ae2e726..4fff5d7 100644
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 Revision history for Spreadsheet-ParseXLSX
 
 {{$NEXT}}
+      - Give a better error message when opening xls files (mchendriks, #52)
 
 0.20  2015-12-05
       - Fix the test suite on perls compiled with -Duselongdouble (Slaven