fix typo in readme
fix typo in readme

functionilaty -> functionality
goodwall/ObjectMapper,baydet/ObjectMapper,cfraz89/ObjectMapper,cfraz89/ObjectMapper,tonyli508/ObjectMapperDeep,ikesyo/ObjectMapper,Busta117/ObjectMapper,ken0nek/ObjectMapper,Busta117/ObjectMapper,baydet/ObjectMapper,Hearst-DD/ObjectMapper,Hearst-DD/ObjectMapper,ikesyo/ObjectMapper,goodwall/ObjectMapper,ken0nek/ObjectMapper,tonyli508/ObjectMapperDeep