Wording correction in README

[jvedock]

Description

there was a flow of text error in the readme, specifically, I changed,
opened and closed very frequently than you expect
to
opened and closed much more frequently than you expect
in the section about important settings, under usage

Checklist

• Code compiles correctly
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary
• Added myself / the copyright holder to the AUTHORS file

[julienschmidt]

Thanks!