csvtk v0.18.0

Changes

• csvtk v0.18.0
  • csvtk: add new flag --ignore-illegal-row to skip illegal rows. #72
  • csvtk summary: add more textual/numeric operations. #64
  • csvtk sort: fix bug for sorting by columns with empty values. #70
  • csvtk grep: add new flag --delete-matched to delete a pattern right after being matched, this keeps the firstly matched data and speedups when using regular expressions. #77