Mention ARC-support in README.
Mention ARC-support in README.
jagreenwood/GrowingTextView,perrystreetsoftware/GrowingTextView,mabuward90/GrowingTextView,alexeylang/GrowingTextView,happy-tanuki/GrowingTextView,Kingside/GrowingTextView,ywzw2013/GrowingTextView,zuojx1013/GrowingTextView,shenhzou654321/GrowingTextView,Meihualu/GrowingTextView,HansPinckaers/GrowingTextView