Prettier show all files with error because of default #203

Clone repository and run "yarn test" - prettier will show error in files because of end of lines. There is no prettier config, so it expect "lf" on end of line (from version 2.0.0 - https://prettier.io/docs/en/options.html#end-of-line) but currenty there is "crlf" in files.
I can prepare PR but what is right option: add .prettierrc with "crlf" end of line configuration value or change end of line in source files to "lf"?