fix readme
fix readme

in readme I found option `stringArrayCallsIndexType`, but if I change this option I didn't get any changes.
After check docs I saw what docs have another option `stringArrayIndexesType`. 
So, I suppouse I should replace this?
javascript-obfuscator/javascript-obfuscator,javascript-obfuscator/javascript-obfuscator,sanex3339/javascript-obfuscator,sanex3339/javascript-obfuscator,javascript-obfuscator/javascript-obfuscator,sanex3339/javascript-obfuscator