Fix README typo
Fix README typo

krakatoa/rpush,rafal-radziszewski/rpush,zakwanhaj/rpush,joshuairl/rpush,rpush/rpush,zenjoy/rpush,chiu/rpush,aried3r/rpush,rafal-radziszewski/rpush,kjnsn/rpush,jmnsf/rpush,amaierhofer/rpush,mandarin6b0/rpush