Update third-party libraries (#1886)

* Update third-party libraries

* Update README

* Update legal.html

README.md

@@ -344,8 +344,8 @@ Required licensing notices for this project follow below:
 Yomichan uses several third-party libraries to function. Below are links to homepages, snapshots, and licenses of the exact
 versions packaged.
 
-*   Handlebars: [homepage](https://handlebarsjs.com/) - [snapshot](http://builds.handlebarsjs.com.s3.amazonaws.com/handlebars.min-714a4c4.js) - [license](https://github.com/wycats/handlebars.js/blob/v4.0.6/LICENSE)
+*   Handlebars: [homepage](https://handlebarsjs.com/) - [snapshot](https://s3.amazonaws.com/builds.handlebarsjs.com/handlebars.min-v4.7.7.js) - [license](https://github.com/handlebars-lang/handlebars.js/blob/v4.7.7/LICENSE)
-*   JSZip: [homepage](https://stuk.github.io/jszip/) - [snapshot](https://raw.githubusercontent.com/Stuk/jszip/de7f52fbcba485737bef7923a83f0fad92d9f5bc/dist/jszip.min.js) - [license](https://github.com/Stuk/jszip/blob/v3.1.3/LICENSE.markdown)
+*   JSZip: [homepage](https://stuk.github.io/jszip/) - [snapshot](https://github.com/Stuk/jszip/blob/v3.7.1/dist/jszip.min.js) - [license](https://github.com/Stuk/jszip/blob/v3.7.1/LICENSE.markdown)
 *   WanaKana: [homepage](https://wanakana.com/) - [snapshot](https://unpkg.com/wanakana@4.0.2/umd/wanakana.min.js) - [license](https://github.com/WaniKani/WanaKana/blob/4.0.2/LICENSE)
 *   parse5: [homepage](https://github.com/inikulin/parse5) - [snapshot](https://github.com/inikulin/parse5/tree/v6.0.1/packages/parse5) - [license](https://github.com/inikulin/parse5/blob/v6.0.1/LICENSE) _(Only used in MV3 build)_
 

ext/legal.html

@@ -54,10 +54,10 @@ and are used in conformance with the Group's <a href="https://www.edrdg.org/edrd
 </pre>
     </div></div></div></div></div>
 
-    <h2><a href="https://github.com/wycats/handlebars.js/blob/v4.0.6/LICENSE" target="_blank" rel="noopener noreferrer">Handlebars v4.0.6</a></h2>
+    <h2><a href="https://github.com/handlebars-lang/handlebars.js/blob/v4.7.7/LICENSE" target="_blank" rel="noopener noreferrer">Handlebars 4.7.7</a></h2>
     <div class="settings-group"><div class="settings-item"><div class="settings-item-inner"><div class="settings-item-left"><div class="settings-item-label">
 <pre>
-Copyright (C) 2011-2016 by Yehuda Katz
+Copyright (C) 2011-2019 by Yehuda Katz
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -79,7 +79,7 @@ THE SOFTWARE.
 </pre>
     </div></div></div></div></div>
 
-    <h2><a href="https://github.com/Stuk/jszip/blob/v3.1.3/LICENSE.markdown" target="_blank" rel="noopener noreferrer">JSZip v3.1.3</a></h2>
+    <h2><a href="https://github.com/Stuk/jszip/blob/v3.7.1/LICENSE.markdown" target="_blank" rel="noopener noreferrer">JSZip v3.7.1</a></h2>
     <div class="settings-group"><div class="settings-item"><div class="settings-item-inner"><div class="settings-item-left"><div class="settings-item-label">
 <pre>
 Copyright (c) 2009-2016 Stuart Knightley, David Duponchel, Franz Buchinger, António Afonso