Add costume icon and bump font size

src/components/asset-panel/selector.css

@@ -22,7 +22,7 @@
     display: flex;
     flex-direction: column;
     align-items: center;
-    font-size: 0.6rem;
+    font-size: 0.75rem;
     cursor: pointer;
     transition: 0.2s;
 }

src/containers/costume-tab.jsx

@@ -5,7 +5,7 @@ const bindAll = require('lodash.bindall');
 const VM = require('scratch-vm');
 
 const AssetPanel = require('../components/asset-panel/asset-panel.jsx');
-const addCostumeIcon = require('../components/asset-panel/icon--add-sound-lib.svg');
+const addCostumeIcon = require('../components/asset-panel/icon--add-costume-lib.svg');
 
 const {connect} = require('react-redux');