Upgrade to upstream version

[ericgaspar]

Problem

• New version upstream

Solution

• Upgrade to version upstream 2020-07-29
• Cleaning up READMEs
• Small typos all around

PR Status

• [ ] Code finished.
• [ ] Tested with Package_check.
• [ ] Fix or enhancement tested.
• [ ] Upgrade from last version tested.
• [ ] Can be reviewed and tested.

Validation

---

• [x] Code review : Kay0u
• [x] Approval (LGTM) : Kay0u Code review and approval have to be from a member of @YunoHost-Apps/apps-group
• CI succeeded :

[alexAubin]

Let's merge this since everybody seems happy with the PR ? :thinking: