Add AppVeyor badge and make Travis badge only look at master [ci skip]
-Selenium [![Build Status](https://travis-ci.org/SeleniumHQ/selenium.svg)](//travis-ci.org/SeleniumHQ/selenium)
+Selenium [![Travis Status](https://travis-ci.org/SeleniumHQ/selenium.svg?branch=master)](//travis-ci.org/SeleniumHQ/selenium) [![AppVeyor Status](https://ci.appveyor.com/api/projects/status/pg1f99p1aetp9mk9/branch/master?svg=true)](https://ci.appveyor.com/project/SeleniumHQ/selenium/branch/master)
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[![SeleniumHQ](http://www.seleniumhq.org/images/big-logo.png)](http://www.seleniumhq.org/)
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Selenium is an umbrella project encapsulating a variety of tools and
libraries enabling web browser automation. Selenium specifically
provides infrastructure for the [W3C WebDriver specification](https://dvcs.w3.org/hg/webdriver/raw-file/tip/webdriver-spec.html)
