Upgrade bzip2 to 1.0.6.
diff --git a/PCbuild/readme.txt b/PCbuild/readme.txt
index 2146221..9a33d94 100644
--- a/PCbuild/readme.txt
+++ b/PCbuild/readme.txt
@@ -121,21 +121,21 @@
     Download the source from the python.org copy into the dist
     directory:
 
-    svn export http://svn.python.org/projects/external/bzip2-1.0.5
+    svn export http://svn.python.org/projects/external/bzip2-1.0.6
 
     ** NOTE: if you use the Tools\buildbot\external(-amd64).bat approach for
     obtaining external sources then you don't need to manually get the source
     above via subversion. **
 
     A custom pre-link step in the bz2 project settings should manage to
-    build bzip2-1.0.5\libbz2.lib by magic before bz2.pyd (or bz2_d.pyd) is
+    build bzip2-1.0.6\libbz2.lib by magic before bz2.pyd (or bz2_d.pyd) is
     linked in PCbuild\.
     However, the bz2 project is not smart enough to remove anything under
-    bzip2-1.0.5\ when you do a clean, so if you want to rebuild bzip2.lib
-    you need to clean up bzip2-1.0.5\ by hand.
+    bzip2-1.0.6\ when you do a clean, so if you want to rebuild bzip2.lib
+    you need to clean up bzip2-1.0.6\ by hand.
 
     All of this managed to build libbz2.lib in 
-    bzip2-1.0.5\$platform-$configuration\, which the Python project links in.
+    bzip2-1.0.6\$platform-$configuration\, which the Python project links in.
 _lzma
     Python wrapper for the liblzma compression library.