Update list of supported bisons.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25082 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GettingStarted.html b/docs/GettingStarted.html
index 369b403..fd4fd5a 100644
--- a/docs/GettingStarted.html
+++ b/docs/GettingStarted.html
@@ -362,7 +362,7 @@
 
     <tr>
       <td><a href="http://www.gnu.org/software/bison/bison.html">Bison</a></td>
-      <td>1.28, 1.35, 1.75, or 2.0 (not 1.85)</td>
+      <td>1.28, 1.35, 1.75, 1.875d, 2.0, or 2.1<br>(not 1.85 or 1.875)</td>
       <td>YACC compiler</td>
     </tr>