Update package.json to reflect organization
Update package.json to reflect organization

The name of the remote repository was attached to the previous username. This change updates the package.json references to the remote Git URLs with the organization `jspsych`.
wolfgangwalther/jsPsych,jspsych/jsPsych,jspsych/jsPsych,wolfgangwalther/jsPsych,jspsych/jsPsych,jodeleeuw/jsPsych,jspsych/jsPsych