[geary] Fix a couple of typos in INSTALL

[Piotr Drąg <piotrdrag src gnome org>]

commit fd530d88977a5eddf3dc183ea64dc9e3de2bc6d9
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Oct 23 18:34:12 2017 +0200

    Fix a couple of typos in INSTALL

 INSTALL |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/INSTALL b/INSTALL
index 73f1c24..2fe6cc4 100644
--- a/INSTALL
+++ b/INSTALL
@@ -73,8 +73,8 @@
   * 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 not
-    meet the minimium requirements, users of that are encourage to use
+    the required libraries. Note that Ubuntu 16.04 LTS (Xenial) does not
+    meet the minimum requirements, users of that are encourage to use
     Geary 0.12 LTS instead.
 
     Debian 9 (Stretch) and later ships with the correct versions of