check content-type rather than extension when making animated gif
check content-type rather than extension when making animated gif

bomoko/p5.js,dhowe/p5.js,processing/p5.js,bomoko/p5.js,limzykenneth/p5.js,mlarghydracept/p5.js,limzykenneth/p5.js,mlarghydracept/p5.js,dhowe/p5.js,processing/p5.js