[nautilus] README: Fix typo

[Ondrej Holy <oholy src gnome org>]

commit 373b17c8f81508a9a29c03cabe8094530c551b02
Author: Ondrej Holy <oholy redhat com>
Date:   Wed Jan 20 08:57:11 2021 +0100

    README: Fix typo

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index ba303a6da..b78215a71 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ To build the development version of the Files app and hack on the code
 see the [general guide](https://wiki.gnome.org/Newcomers/BuildProject)
 for building GNOME apps with Flatpak and GNOME Builder.
 
-# Runtime dependencies
+## Runtime dependencies
 - [Bubblewrap](https://github.com/projectatomic/bubblewrap) installed. Used for security reasons.
 - [Tracker (including tracker-miners)](https://gitlab.gnome.org/GNOME/tracker) properly set up and with all 
features enabled. Used for fast search and metadata extraction, starred files and batch renaming.