update download link in docs
update download link in docs

msrresearch/jsPsych,adrianoesch/jsPsych,adrianoesch/jsPsych,jspsych/jsPsych,wolfgangwalther/jsPsych,vergenzt/jsPsych,vergenzt/jsPsych,andyh616/jsPsych,jspsych/jsPsych,Scienthusiast/jsPsych,erikasf/jsPsych,shamrt/jsPsych,Scienthusiast/jsPsych,jodeleeuw/jsPsych,jspsych/jsPsych,erikasf/jsPsych,jspsych/jsPsych,shamrt/jsPsych,andyh616/jsPsych,wolfgangwalther/jsPsych