Update CI badges, update preview version link

Having the CI on their own line prevents the initial line from getting
way too long.

The preview version link should not show in development alpha branches,
but only the relatively tested master.

Readme.md

@@ -1,5 +1,6 @@
 ![language](https://img.shields.io/badge/Language-C%2B%2B17%2C%20QML-green.svg) ![dependencies](https://img.shields.io/badge/Dependencies-OpenVR%2C%20Qt5%2C%20Python3-green.svg)
 ![license_gpl3](https://img.shields.io/badge/License-GPL%203.0-green.svg) 
+
 [![Build status](https://ci.appveyor.com/api/projects/status/8oivf5xws6vsq2x3/branch/master?svg=true)](https://ci.appveyor.com/project/icewind1991/openvr-advancedsettings/branch/master)
 [![Build Status](https://travis-ci.org/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings.svg?branch=master)](https://travis-ci.org/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings)
 
@@ -128,7 +129,7 @@ The logging output of the [Easylogging++ library](https://github.com/zuhd-org/ea
 <a name="preview_builds"></a>
 ## Preview builds
 
-If you want to try latest and greatest unreleased features, you can download latest from the CI (Continuous Integration) server for [Windows](https://ci.appveyor.com/project/icewind1991/openvr-advancedsettings). The Linux CI does not provide binary artifacts.
+If you want to try latest and greatest unreleased features, you can download latest from the CI (Continuous Integration) server for [Windows](https://ci.appveyor.com/project/icewind1991/openvr-advancedsettings/branch/master). The Linux CI does not provide binary artifacts.
 
 These version are not stable and this should be considered for advanced users only.