artbio ❤️ Eco

[drosofff]

Please find a modest contribution to the xls2tab_R tool

• use conda r-readxl=1.3.1
• no need for specifying R dependency
• Add another test
• signal that xls input has not been tested
• minor linting of R script

[yvanlebras]

Thank you so much Christophe! Hope all is doing well on you side! @colineroyaux can you check it and move to galaxyecology repo?