Update Windows build to sqlite 3.6.21.
diff --git a/PCbuild/readme.txt b/PCbuild/readme.txt
index 44b7b8f..0386b45 100644
--- a/PCbuild/readme.txt
+++ b/PCbuild/readme.txt
@@ -107,7 +107,7 @@
Wraps Berkeley DB 4.7.25, which is currently built by _bsddb.vcproj.
project (see below).
_sqlite3
- Wraps SQLite 3.5.9, which is currently built by sqlite3.vcproj (see below).
+ Wraps SQLite 3.6.21, which is currently built by sqlite3.vcproj (see below).
_tkinter
Wraps the Tk windowing system. Unlike _bsddb and _sqlite3, there's no
corresponding tcltk.vcproj-type project that builds Tcl/Tk from vcproj's