fix typo in Readme
fix typo in Readme

stuertz/restic,restic/restic,jayme-github/restic,ckemper67/restic,arithmetric/restic,middelink/restic,fawick/restic,kurin/restic,pombredanne/restic,mappu/restic,ar-jan/restic,byo/restic,episource/restic,howeyc/restic,kurin/restic,ar-jan/restic,middelink/restic,stuertz/restic,jayme-github/restic,byo/restic,fawick/restic,bchapuis/restic,restic/restic