Fix readme.md

I think we are hitting a bug in the markdown processing, where triple backticks are not working properly... I got it to work another way here though, so saving this to make the readme show up properly.

Author: liquidpele

README.rst

@@ -258,19 +258,15 @@ The last command must be executed as a privileged user if
 you are not currently using a virtualenv.
 
 
-After installation, add `django_celery_beat` to Django settings file and migrate.
-
-settings.py
-```
-INSTALLED_APPS = [
-    ...,
-    'django_celery_beat',
-]
-```
-
-```
-python manage.py migrate django_celery_beat
-```
+After installation, add ``django_celery_beat`` to Django settings file::
+
+    INSTALLED_APPS = [
+        ...,
+        'django_celery_beat',
+    ]
+
+    python manage.py migrate django_celery_beat
+
 
 Using the development version
 -----------------------------