Mention BBV in the README.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10446 a5019735-40e9-0310-863c-91ae7b9d1cf9
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 The Valgrind distribution currently includes six production-quality
 tools: a memory error detector, two thread error detectors, a cache and
 branch-prediction profiler, a call-graph generating cache profiler, and
-a heap profiler. It also includes one experimental tool, which detects
-out of bounds reads and writes of stack, global and heap arrays.
+a heap profiler. It also includes two experimental tools:  a
+heap/stack/global array overrun detector, and a SimPoint basic block vector
+generator.
 
 Valgrind is closely tied to details of the CPU, operating system and to
 a lesser extent, compiler and basic C libraries. This makes it difficult