Update gitignore

Ignore test-driver

Change-Id: Id2dfa273021f0ea67835b2d2c3a22d00f835c2ab
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/.gitignore b/.gitignore
index bc805a5..59cd8a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@
 phosphor-fan-monitor

 phosphor-cooling-type

 fan_monitor_defs.cpp

+test-driver