Fix the definition of class Note in VexFlow.

- The Note constructor should accept either zero argument or one argument.

types/vexflow/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for VexFlow v1.2.83
+// Type definitions for VexFlow v1.2.84
 // Project: http://vexflow.com
 // Definitions by: Roman Quiring <https://github.com/rquiring>
 //                 Sebastian Haas <https://github.com/sebastianhaas/>
@@ -618,8 +618,8 @@ declare namespace Vex {
             getTickMultiplier() : Fraction;
             applyTickMultiplier(numerator : number, denominator : number) : void;
             setDuration(duration : Fraction) : void;
-
-            constructor(note_struct : {type? : string, dots? : number, duration : string});
+	    
+            constructor(note_struct? : {type? : string, dots? : number, duration : string});
             getPlayNote() : any;
             setPlayNote(note : any) : Note;
             isRest() : boolean;

types/vexflow/vexflow-tests.ts

@@ -34,16 +34,20 @@ notes1[2].addModifier(0, new Vex.Flow.GraceNoteGroup([gracenote], true).beamNote
 // Color the chord
 notes1[3].setStyle({fillStyle: "blue", strokeStyle: "blue"});
 
+// Add a bar
+var tickable1: Vex.Flow.Note[] = notes1;
+tickable1.push(new Vex.Flow.BarNote());
+
 // Create a voice in 4/4 and add notes
 var voice1 = new Vex.Flow.Voice({
     num_beats: 4,
     beat_value: 4,
     resolution: Vex.Flow.RESOLUTION
-}).addTickables(notes1);
+}).addTickables(tickable1);
 
 // Create a second voice with just one whole note
 var voice2 = new Vex.Flow.Voice(Vex.Flow.TIME4_4).
-    addTickables([new Vex.Flow.StaveNote({keys: ["c/4"], duration: "w"})]);
+    addTickables([new Vex.Flow.StaveNote({keys: ["c/4"], duration: "w"}), new Vex.Flow.BarNote()]);
 
 // Format and justify the notes to 550 pixels
 var formatter = new Vex.Flow.Formatter().
@@ -85,4 +89,4 @@ var notes = [
 ];
 
 // Format ad draw the notes
-Vex.Flow.Formatter.FormatAndDraw(ctx, tabstave, notes);
+Vex.Flow.Formatter.FormatAndDraw(ctx, tabstave, notes);