[geary] Brown paper bag fix for Xenial support in INSTALL.

[Michael Gratton <mjog src gnome org>]

commit aaee6b104439042d0d6dd611e80bc3918c2257c2
Author: Michael James Gratton <mike vee net>
Date:   Mon Oct 23 12:31:26 2017 +1100

    Brown paper bag fix for Xenial support in INSTALL.

 INSTALL |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/INSTALL b/INSTALL
index c83e69e..73f1c24 100644
--- a/INSTALL
+++ b/INSTALL
@@ -73,7 +73,7 @@
   * Installing dependencies on Ubuntu/Debian
 
     Ubuntu 17.04 (Zesty) and later ships with the correct versions of
-    the required libraries. Note that Ubutnu 16.04 LTS (Xenial) does
+    the required libraries. Note that Ubutnu 16.04 LTS (Xenial) does not
     meet the minimium requirements, users of that are encourage to use
     Geary 0.12 LTS instead.