[geary] INSTALL: Use dnf rather than yum for Fedora deps

[Michael Gratton <mjog src gnome org>]

commit 884439da2f404de1effd78bc36248af35088a674
Author: Michael Gratton <mike vee net>
Date:   Mon Oct 7 21:36:12 2019 +1100

    INSTALL: Use dnf rather than yum for Fedora deps

 INSTALL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/INSTALL b/INSTALL
index f77f3b52..5e275d57 100644
--- a/INSTALL
+++ b/INSTALL
@@ -39,7 +39,7 @@ Installing dependencies on Fedora
 
 Install them by running this command:
 
-    sudo yum install meson vala desktop-file-utils enchant2-devel \
+    sudo dnf install meson vala desktop-file-utils enchant2-devel \
         folks-devel gcr-devel glib2-devel gmime-devel \
         gnome-online-accounts-devel gspell-devel gtk3-devel \
         iso-codes-devel json-glib-devel libappstream-glib-devel \