Clarify README
Clarify README

sungwoncho/has_friendship,sungwoncho/has_friendship,tkubicek3/my_has_friendships,yhoshino11/has_friendship,sbadura/has_friendship,sbadura/has_friendship,tkubicek3/my_has_friendships,yhoshino11/has_friendship,sbadura/has_friendship,tkubicek3/my_has_friendships,yhoshino11/has_friendship