Minor typos in README.md
"if-modified-since" was mis-spelled "if-modifified-since" in both main.js and test.js , so they matched but likely weren't as desired?
BTW: why is there both ./test.js and ./test-server.js , and test/test.js and test/server.js ? Which is the 'correct' test ? I've only updated ./test.js here.
one doc typo and two code typos