Update README a bit.

Author: adriaanm

README.md

@@ -1,14 +1,17 @@
-scala.swing BETA
+scala-swing (unsupported) [<img src="https://api.travis-ci.org/scala/scala-swing.png"/>](https://travis-ci.org/scala/scala-swing)
+=========
+
+We welcome contributions, but do not actively maintain this library.
+If you're interested in becoming a maintainer, please contact @adriaanm.
 
 This is a UI library that will wrap most of Java Swing for Scala in a straightforward manner. 
 The widget class hierarchy loosely resembles that of Java Swing. The main differences are:
 
-  In Java Swing all components are containers per default. This doesn't make much sense for 
+- In Java Swing all components are containers per default. This doesn't make much sense for
   a number of components, like TextField, CheckBox, RadioButton, and so on. Our guess is that 
   this architecture was chosen because Java lacks multiple inheritance. 
   In scala.swing, components that can have child components extend the Container trait.
-  
-  Layout managers and panels are coupled. There is no way to exchange the layout manager 
+-  Layout managers and panels are coupled. There is no way to exchange the layout manager
   of a panel. As a result, the layout constraints for widgets can be typed. 
   (Note that you gain more type-safety and don't loose much flexibility here. Besides 
   being not a common operation, exchanging the layout manager of a panel in Java 
@@ -21,17 +24,11 @@ The widget class hierarchy loosely resembles that of Java Swing. The main differ
 
 The library comprises three main packages:
 
-  scala.swing
-    All widget classes and traits.
-    
-  scala.swing.event
-    The event hierarchy.
-
-  scala.swing.test
-    A set of demos.
+- `scala.swing`: All widget classes and traits.
+- `scala.swing.event`: The event hierarchy.
+- `scala.swing.test`: A set of demos.
 
 
 Notes:
 
-Visual appearance of combo boxes using the GTK LaF is broken on JDKs < 1.7b30. 
-This is a Java Swing problem.
+- Visual appearance of combo boxes using the GTK LaF is broken on JDKs < 1.7b30. This is a Java Swing problem.