Merge pull request #63 from follower/patch-1

Typo fix: "sinlge" -> "single"

README.md

@@ -232,7 +232,7 @@ If `comment` is a `Buffer`, it should be a CP437 encoded string.
 This becomes the ".ZIP file comment" field in the end of central directory record.
 Note that in practice, most zipfile readers interpret this field in UTF-8 instead of CP437.
 If your string uses only codepoints in the range `0x20...0x7e`
-(printable ASCII, no whitespace except for sinlge space `' '`),
+(printable ASCII, no whitespace except for single space `' '`),
 then UTF-8 and CP437 (and ASCII) encodings are all identical.
 This restriction is recommended for maxium compatibility.
 To use UTF-8 encoding at your own risk, pass a `Buffer` into this function; it will not be validated.