README: Fix header formatting

Address formatting failures from CI.

Change-Id: Iab2a07d6eb5bfecaeb7f250b85f00596d09aa948
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/README.md b/README.md
index 0d5d38c..5eec8e5 100644
--- a/README.md
+++ b/README.md
@@ -1,15 +1,15 @@
-# BMC Debug Trigger #
+# BMC Debug Trigger
 
 `debug-trigger` listens for an external signal that the BMC is in some way
 unresponsive. When the signal is received it triggers a crash to collect debug
 data and reboots the system in the hope that it will recover.
 
-## Trigger sources ##
+## Trigger sources
 
 `debug-trigger` implements a simple protocol over an LPC KCS device as its
 trigger source.
 
-## Debug actions ##
+## Debug actions
 
 `debug-trigger` implements a single action once the trigger event is received,
 which is to crash the kernel via `/proc/sysrq-trigger`. For systems with kdump