README: typo fix s/differnet/different/

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I4f00d0d7581fca78bc9e23f3db55c36aac254096
diff --git a/README.md b/README.md
index b6cb80a..512357c 100644
--- a/README.md
+++ b/README.md
@@ -109,6 +109,6 @@
 ## Flash State Machine Details
 
 [This document](ipmi_flash.md) describes the details of the state machine
-implemented and how differnet interactions with it will respond.  This also
+implemented and how different interactions with it will respond.  This also
 describes how a host-side tool is expected to talk to it (triggering different
 states and actions).