bump version

Author: bodewig

appveyor.yml

@@ -1,4 +1,4 @@
-version: 2.7.3.{build}
+version: 2.8.0.{build}
 
 image:
   - Visual Studio 2013

src/doc/monodoc/core/index.xml

@@ -45,5 +45,5 @@
       under <format type="text/html"><a href="https://github.com/xmlunit/xmlunit.net/blob/master/LICENSE">the
       Apache License, Version 2.0</a></format>.</para></Remarks>
   <Copyright></Copyright>
-  <Title>XMLUnit.NET 2.7.3-alpha-01</Title>
+  <Title>XMLUnit.NET 2.8.0-alpha-01</Title>
 </Overview>

src/shared/CommonAssemblyInfo.cs

@@ -25,7 +25,7 @@ namespace Org.XmlUnit
 {
     internal static class XmlUnitVersion
     {
-        internal const string ApiVersion = "2.7.3";
+        internal const string ApiVersion = "2.8.0";
         internal const string AssemblyVersion = ApiVersion + ".179";
         internal const string Version = ApiVersion + "-alpha-01";
     }