[glibmm] README: Fix a misspelling

[Kjell Ahlstedt <kjellahl src gnome org>]

commit d56907110a524d867404a9f9d95bce7bd818f541
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Mar 19 14:00:02 2020 +0100

    README: Fix a misspelling

 README | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README b/README
index 60bcd050..b6417674 100644
--- a/README
+++ b/README
@@ -35,7 +35,7 @@ files used by Autotools.
 If the tarball was made with Autotools, you must enable maintainer-mode:
   $ meson configure -Dmaintainer-mode=yes
 
-Then, reguardless of how the tarball was made:
+Then, regardless of how the tarball was made:
   $ ninja
   $ ninja install
 You can run the tests like so:
@@ -48,7 +48,7 @@ If the tarball was made with Autotools:
 If the tarball was made with Meson, you must enable maintainer-mode:
   $ ./autogen.sh --prefix=/some_directory
 
-Then, reguardless of how the tarball was made:
+Then, regardless of how the tarball was made:
   $ make
   $ make install
 You can build the examples and tests, and run the tests, like so: