UMI-tools: include additional symbols in the sanitizer

[gallardoalba]

FOR CONTRIBUTOR:

• - I have read the CONTRIBUTING.md document and this tool is appropriate for the tools-iuc repo.
• - License permits unrestricted use (educational + commercial)
• - This PR adds a new tool or tool collection
• - This PR updates an existing tool or tool collection
• - This PR does something else (explain below)

This PR includes two additional signs ($ and +) in the sanitizer. It was requested by an user in GHelp.

[bgruening]

But we need to fix the linting before we merge.