[perl-ExtUtils-PkgConfig] README: updated docs after addition of exists() method

[Brian Manning <bmanning src gnome org>]

commit 65a3123547addae891855330af1acd1838192f5b
Author: Brian Manning <bmanning src gnome org>
Date:   Thu Apr 20 18:52:52 2017 -0700

    README: updated docs after addition of exists() method

 README |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index 11b84d1..e4f8c02 100644
--- a/README
+++ b/README
@@ -11,6 +11,8 @@ SYNOPSIS
      print "cflags:      $pkg_info{cflags}\n";
      print "libs:        $pkg_info{libs}\n";
 
+     $exists = ExtUtils::PkgConfig->exists($package);
+
      $modversion = ExtUtils::PkgConfig->modversion($package);
 
      $libs = ExtUtils::PkgConfig->libs($package);