python/defusedxml: Wrap README at 72 columns.

Signed-off-by: B. Watson <yalhcru@gmail.com>

python/defusedxml/README

@@ -1,7 +1,8 @@
-The results of an attack on a vulnerable XML library can be fairly dramatic.
-With just a few hundred Bytes of XML data an attacker can occupy several
-Gigabytes of memory within seconds.  An attacker can also keep CPUs busy for a
-long time with a small to medium size request.  Under some circumstances it is
-even possible to access local files on your server, to circumvent a firewall,
-or to abuse services to rebound attacks to third parties.  This library allows
-for XML to be parsed in a manner that avoids these pitfalls.
+The results of an attack on a vulnerable XML library can be fairly
+dramatic. With just a few hundred Bytes of XML data an attacker
+can occupy several Gigabytes of memory within seconds. An attacker
+can also keep CPUs busy for a long time with a small to medium size
+request. Under some circumstances it is even possible to access local
+files on your server, to circumvent a firewall, or to abuse services
+to rebound attacks to third parties. This library allows for XML to
+be parsed in a manner that avoids these pitfalls.