Merge pull request #811 from mathjax/sre_tospeech_api

Expose SRE's toSpeech

Author: zorkow

ts/a11y/sre.ts

@@ -54,6 +54,8 @@ export namespace Sre {
 
   export const toEnriched = Api.toEnriched;
 
+  export const toSpeech = Api.toSpeech;
+
   export const clearspeakPreferences = ClearspeakPreferences;
 
   export const getHighlighter = HighlighterFactory.highlighter;