Upgrade to jQuery 3.5.1

[delosrogers]

Changed .click() and .keyup() to .on() and changed the version of jQuery in the package.json to 3.5.1 . I have tested this on my own site and by deploying clustergrammer-web with these changes and I have not seen any errors in the console or encountered any other issues in upgrading versions. It is still possible that there is a part of the library I haven't tested so I am also interested in writing more tests to make sure there aren't any hidden breaking changes in jQuery 3.5.1 . Fixes #56

[cornhundred]

Thanks @delosrogers, I'll have a look to make sure it is working and request that the merge the pull request soon.