Update minor version number

Author: RoyEJohnson

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@openstax/os-webview",
-    "version": "2.28.0",
+    "version": "2.28.1",
     "description": "OpenStax webview",
     "scripts": {
         "start": "gulp dev",

src/index.html

@@ -50,13 +50,13 @@
         </script>
         <script src="https://www.google-analytics.com/analytics.js"></script>
         <script src="https://cdn.optimizely.com/js/7893320024.js"></script>
-        <script defer src="/settings.js?v2.28.0"></script>
-        <script defer src="/babel.dll.js?v2.28.0"></script>
-        <script defer src="/library.dll.js?v2.28.0"></script>
+        <script defer src="/settings.js?v2.28.1"></script>
+        <script defer src="/babel.dll.js?v2.28.1"></script>
+        <script defer src="/library.dll.js?v2.28.1"></script>
         <script defer src="https://use.fontawesome.com/releases/v5.2.0/js/all.js"></script>
         <script defer src="https://cdnjs.cloudflare.com/ajax/libs/postscribe/2.0.8/postscribe.min.js"></script>
-        <script defer src="/mapbox.dll.js?v2.28.0"></script>
-        <script defer src="/bundle.js?v2.28.0"></script>
+        <script defer src="/mapbox.dll.js?v2.28.1"></script>
+        <script defer src="/bundle.js?v2.28.1"></script>
         <script>
             piAId = '219812';
             piCId = '1120';
@@ -72,7 +72,7 @@
             })();
         </script>
 
-        <link rel="stylesheet" href="/styles/main.css?v2.28.0">
+        <link rel="stylesheet" href="/styles/main.css?v2.28.1">
         <link rel="stylesheet" href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.47.0/mapbox-gl.css'>
         <link rel="prefetch" href="/styles/fonts/3dac71eb-afa7-4c80-97f0-599202772905.woff2">
         <link rel="prefetch" href="/styles/fonts/531c5a28-5575-4f58-96d4-a80f7b702d7b.woff2">