git: Make all graph colors bold

This looks a bit better in my opinion.

.config/git/config

@@ -134,9 +134,10 @@
 	singleKey = true
 [log]
 	follow = true
-	# Use bright instead of bold colors. See column_colors_ansi in git's
+	# Make all colors bold and additionally use bright versions of
-	# color.c used by graph.c
+	# previously bold-only colors. See column_colors_ansi in git's color.c
-	graphColors = red,green,yellow,blue,magenta,cyan,brightred,brightgreen,brightyellow,brightblue,brightmagenta,brightcyan
+	# used by graph.c
+	graphColors = bold red,bold green,bold yellow,bold blue,bold magenta,bold cyan,bold brightred,bold brightgreen,bold brightyellow,bold brightblue,bold brightmagenta,bold brightcyan
 [merge]
 	conflictstyle = diff3
 	log = true