changed easeOutExpo so that it returns endVal when target=duration.
changed easeOutExpo so that it returns endVal when target=duration.

Bpaterak/ticker,allancorrigall/countUp.js,mikaelgson/countUp.js,lnorganik/countUp.js,wuyuedefeng/countUp.js,lnorganik/countUp.js,inorganik/countUp.js,mikaelgson/countUp.js,wuyuedefeng/countUp.js,kutou/countUp.js,Bpaterak/ticker,slang800/countUp.js,inorganik/countUp.js,anandbaskaran/countUp.js,lnorganik/countUp.js,anandbaskaran/countUp.js,kutou/countUp.js,inorganik/countUp.js,allancorrigall/countUp.js