sindresorhus/pretty-bytes — pull request #5 by dendory (2014-11-05 17:39:50+00:00)
Title: Changed 'kB' to 'KB'

In the International System of Quantities, the kilobyte (symbol kB) is 1000 bytes, while the kibibyte (symbol KiB) is 1024 bytes. The binary representation of 1024 bytes typically uses the symbol KB, with an uppercase K.

-- http://en.wikipedia.org/wiki/Kilobyte