Recommend installation of wagtail_modeladmin for Wagtail version 5.1+, Move installation of wagtail_modeladmin to extras

Author: katdom13

README.rst

@@ -53,7 +53,8 @@ and ``wagtailfontawesome`` apps in your project's ``INSTALLED_APPS``:
 
     INSTALLED_APPS = [
         # ...
-        'wagtail_modeladmin' if WAGTAIL_VERSION >= (5, 1) else 'wagtail.contrib.modeladmin',
+        'wagtail_modeladmin',          # if Wagtail >=5.1; Don't repeat if it's there already
+        'wagtail.contrib.modeladmin',  # if Wagtail <5.1;  Don't repeat if it's there already
         'wagtail_personalisation',
         'wagtailfontawesome',
         # ...

setup.py

@@ -7,7 +7,6 @@
     "user-agents>=1.1.0",
     "wagtailfontawesome>=1.2.1",
     "pycountry",
-    "wagtail_modeladmin>=1.0",
 ]
 
 tests_require = [
@@ -24,6 +23,7 @@
     "pytest==6.2.5",
     "wagtail_factories==4.1.0",
     "pytest-mock==3.8.1",
+    "wagtail_modeladmin>=1.0",
 ]
 
 docs_require = [