update wording about SSL pinning
update wording about SSL pinning

kzganesan/card.io-Android-SDK,0359xiaodong/card.io-Android-SDK,swapnilbhai90/card.io-Android-SDK,xubuhang/card.io-Android-SDK,arifin123/card.io-Android-SDK,krumman/card.io-Android-SDK,card-io/card.io-Android-SDK,hgl888/card.io-Android-SDK,lucky1603/card.io-Android-SDK