readme: fix typo
readme: fix typo

Signed-off-by: Simon Eskildsen <45eacc387ab7753b0a8a7fc2468e8b111e84fef3@sirupsen.com>

charliesome/semian,fgbreel/semian,Shopify/semian,charliesome/semian,Shopify/semian,fgbreel/semian,fgbreel/semian,Shopify/semian,charliesome/semian