Fix some typo and mistake in README
Fix some typo and mistake in README

Signed-off-by: onevcat <58d0c0df3ea9eba666b421252347024513bf8bb5@gmail.com>

oarrabi/ObjectiveSugar,onevcat/ObjectiveSugar,rizvve/ObjectiveSugar,orta/ObjectiveSugar,target/ObjectiveSugar,ManagerOrganization/ObjectiveSugar,gank0326/ObjectiveSugar,Anish-kumar-dev/ObjectiveSugar,supermarin/ObjectiveSugar