Fix spelling of certain words in README.md
Fix spelling of certain words in README.md

aknuds1/s4cmd,npyoung/s4cmd,sysalexis/s4cmd,sysalexis/s4cmd,bloomreach/s4cmd,deepsentinel/s4cmd,bloomreach/s4cmd,npyoung/s4cmd,aknuds1/s4cmd,deepsentinel/s4cmd,Nmishin/s4cmd,Nmishin/s4cmd