adjust history.txt. Also, that last fix on RDRAND is thanks to John Mark Gurney.

5cf60381 · Mike Hamburg · b9812517 · 5cf60381
Commit 5cf60381 authored Mar 01, 2015 by Mike Hamburg
--- a/HISTORY.txt
+++ b/HISTORY.txt
+March 1, 2015:
+    Not much to report.  Most of the fixes since Oct 27 last year have
+    been bug fixes or simplifications, or in the Decaf branch.
+
 October 27, 2014:
    Added more support for >512-bit primes.  Changed shared secret
    to not overflow the buffer in this case.  Changed hashing to