Fix the typo in the readme of all packages

See !57 (merged)

assigned to @jdiefenbaugh

mentioned in commit bob.db.swan@9adf5567

mentioned in commit bob.io.audio@2e73bd2c

mentioned in commit bob.io.base@2ad85a73

mentioned in commit bob.io.image@6959890e

mentioned in commit bob.io.matlab@aa208972

mentioned in commit bob.io.video@1cf541bc

mentioned in commit bob.ip.base@1ac20fdd

mentioned in commit bob.ip.color@fff23621

mentioned in commit bob.pad.face@9b51dc2e

This typo is now fixed on all packages thanks to @jdiefenbaugh's work last week.

closed