Update URL of Mersenne Twister Home Page (#20)

Modules/_randommodule.c

@@ -2,7 +2,7 @@
 
 /* ------------------------------------------------------------------
    The code in this module was based on a download from:
-      http://www.math.keio.ac.jp/~matumoto/MT2002/emt19937ar.html
+      http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html
 
    It was modified in 2002 by Raymond Hettinger as follows:
 
@@ -60,8 +60,8 @@
 
 
    Any feedback is very welcome.
-   http://www.math.keio.ac.jp/matumoto/emt.html
-   email: matumoto@math.keio.ac.jp
+   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
+   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
 */
 
 /* ---------------------------------------------------------------*/