Bold function names in tracediff2.
diff --git a/scripts/highlight.py b/scripts/highlight.py
index f76b1ab..1d49469 100644
--- a/scripts/highlight.py
+++ b/scripts/highlight.py
@@ -96,8 +96,11 @@
     def color(self, color):
         self._escape(str(30 + color) + 'm')
 
-    def bold(self):
-        self._escape(self._bold)
+    def bold(self, enable = True):
+        if enable:
+            self._escape('1m')
+        else:
+            self._escape('21m')
 
     def italic(self):
         self._escape(self._italic)