Update documentation to match what the project became

README.md

@@ -1,8 +1,12 @@
-# bugbug - Classify Bugzilla bugs between actual bugs and bugs that aren't bugs
+# bugbug
 
-Bugs on Bugzilla aren't always bugs. Sometimes they are feature requests, refactorings, and so on. The aim of this project is to distinguish between bugs that are actually bugs and bugs that aren't.
+## Classifiers
+- **bug vs feature** - Bugs on Bugzilla aren't always bugs. Sometimes they are feature requests, refactorings, and so on. The aim of this classifier is to distinguish between bugs that are actually bugs and bugs that aren't. The dataset currently contains 2110 bugs, the accuracy of the current classifier is ~93% (precision ~95%, recall ~94%).
+
+- **regression vs non-regression** - Bugzilla has a `regression` keyword to identify bugs that are regressions. Unfortunately it isn't used consistently. The aim of this classifier is to detect bugs that are regressions.
+
+- **tracking** - The aim of this classifier is to detect bugs to track.
 
-The dataset currently contains 2110 bugs, the accuracy of the current classifier is ~93% (precision ~95%, recall ~94%).
 
 ## Setup