Merge branch 'lh/use-gnu-color-in-grep'

The color palette used by "git grep" has been updated to match that
of GNU grep.

* lh/use-gnu-color-in-grep:
  grep: align default colors with GNU grep ones

Author: gitster

grep.c

@@ -26,10 +26,10 @@ static struct grep_opt grep_defaults = {
 	.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED,
 	.colors = {
 		[GREP_COLOR_CONTEXT] = "",
-		[GREP_COLOR_FILENAME] = "",
+		[GREP_COLOR_FILENAME] = GIT_COLOR_MAGENTA,
 		[GREP_COLOR_FUNCTION] = "",
-		[GREP_COLOR_LINENO] = "",
-		[GREP_COLOR_COLUMNNO] = "",
+		[GREP_COLOR_LINENO] = GIT_COLOR_GREEN,
+		[GREP_COLOR_COLUMNNO] = GIT_COLOR_GREEN,
 		[GREP_COLOR_MATCH_CONTEXT] = GIT_COLOR_BOLD_RED,
 		[GREP_COLOR_MATCH_SELECTED] = GIT_COLOR_BOLD_RED,
 		[GREP_COLOR_SELECTED] = "",