Updated the requirements on django-markup.

 - Legacy-Id: 18000

Author: levkowetz

requirements.txt

@@ -15,13 +15,13 @@ django-csp>=3.5
 django-cors-headers>=2.4.0
 django-form-utils>=1.0.3
 django-formtools>=1.0		# instead of django.contrib.formtools in 1.8
-django-markup>=1.1
+django-markup>=1.1,<1.5		# version 1.5 requires Django 2.2
 django-oidc-provider>=0.7
 django-password-strength>=1.2.1
 django-referrer-policy>=1.0
 django-request-profiler>=0.15   # 0.15 and above requires Django 2.x
 django-simple-history>=2.3.0
-django-stubs==1.3.0
+django-stubs==1.3.0		# The django-stubs version used determines the the mypy version indicated below
 django-tastypie>=0.14.1         # For Django 2.0.  Django 2.1 will require 0.14.2; Django 3.0 will require 0.14.3
 django-webtest>=1.9.7
 django-widget-tweaks>=1.4.2