Change Modal casing

example/main.js

@@ -1,5 +1,5 @@
 import Uppy from '../src/core/Core.js'
-import Modal from '../src/plugins/modal'
+import Modal from '../src/plugins/Modal'
 import Dummy from '../src/plugins/Dummy'
 import DragDrop from '../src/plugins/DragDrop'
 import GoogleDrive from '../src/plugins/GoogleDrive'

src/plugins/index.js

@@ -2,7 +2,7 @@
 import Plugin from './Plugin'
 
 // Orchestrators
-import Modal from './modal'
+import Modal from './Modal'
 
 // Acquirers
 import Dummy from './Dummy'