Update README.md

README.md

@@ -1,6 +1,6 @@
 ![DryWetMIDI Logo](https://github.com/melanchall/drywetmidi/blob/develop/Resources/Images/dwm-logo.png)
 
-[![NuGet](https://img.shields.io/nuget/v/Melanchall.DryWetMidi.svg)](https://www.nuget.org/packages/Melanchall.DryWetMidi/) [![Build](https://ci.appveyor.com/api/projects/status/github/melanchall/drywetmidi?svg=true&branch=develop)](https://ci.appveyor.com/project/melanchall/drywetmidi/branch/develop)
+[![NuGet](https://img.shields.io/nuget/v/Melanchall.DryWetMidi.svg)](https://www.nuget.org/packages/Melanchall.DryWetMidi/) [![Build](https://ci.appveyor.com/api/projects/status/github/melanchall/drywetmidi?svg=true&branch=master)](https://ci.appveyor.com/project/melanchall/drywetmidi/branch/master)
 
 DryWetMIDI is the .NET library to work with MIDI files. Visit [Wiki](https://github.com/melanchall/drymidi/wiki) to learn how to use the DryWetMIDI. The library was tested on 130,000 files taken from [here](https://www.reddit.com/r/WeAreTheMusicMakers/comments/3ajwe4/the_largest_midi_collection_on_the_internet/). Thanks *midi-man* for this great collection. You can get the latest version via [NuGet](https://www.nuget.org/packages/Melanchall.DryWetMidi).
 
@@ -197,4 +197,4 @@ Pattern pattern = new PatternBuilder()
     .Build();
 
 MidiFile midiFile = pattern.ToFile(TempoMap.Default);
-```
+```