Raise version number to v0.5.0

Author: badaix

page/index.html

@@ -4,7 +4,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="theme-color" content="#455A64">
   <meta name="author" content="Johannes M. Pohl">
-  <meta name="version" content="0.4.0">
+  <meta name="version" content="0.5.0">
   <meta charset="utf-8">
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   <link rel="manifest" href="manifest.json">