Fix typo in OASISLicense.mli.
Fix typo in OASISLicense.mli.

diml/oasis,Chris00/oasis,gerdstolpmann/oasis,Chris00/oasis,gerdstolpmann/oasis,jpdeplaix/oasis,jpdeplaix/oasis,madroach/oasis,Chris00/oasis,RadicalZephyr/oasis,jpdeplaix/oasis,gerdstolpmann/oasis,diml/oasis,madroach/oasis,RadicalZephyr/oasis