Added PixiJS UI Text class.

lib/pixi/bundle.js

@@ -24,6 +24,7 @@ import Badge from './badge.js'
 import Progress from './progress.js'
 import List from './list.js'
 import { LabeledGraphics, FontInfo } from './labeledgraphics.js'
+import Text from './text.js'
 /* Needed to ensure that rollup.js includes class definitions and the classes
 are visible inside doctests.
 */
@@ -58,3 +59,4 @@ window.Progress = Progress
 window.List = List
 window.LabeledGraphics = LabeledGraphics
 window.FontInfo = FontInfo
+window.Text = Text