Added Possible Values to verbosity option

hoffi · hoffi · commit 3f4dab6e4d6f · 2014-07-13T11:08:34.000+02:00
diff --git a/README.md b/README.md
@@ -112,6 +112,8 @@ msbuild({ properties: { WarningLevel: 2 } })
 
 **Default:** normal
 
+**Possible Values:** quiet, minimal, normal, detailed, diagnostic
+
 #### maxcpucount
 
 > Specifiy Maximal CPU-Count to use
