Fix heroku https upgrade, add funding options

Heroku app instances have been notoriously bad at having the instance
automatically upgraded to https. This adds a step in the before request
decorator to always upgrade heroku apps, since they're always deployed
with the certificate, but never configured to upgrade automatically.

Fixes #153

.github/FUNDING.yml

@@ -0,0 +1,9 @@
+# These are supported funding model platforms
+github: benbusby
+ko_fi: benbusby
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

app/routes.py

@@ -57,10 +57,12 @@ def before_request_func():
     if session['uuid'] not in app.user_elements:
         app.user_elements.update({session['uuid']: 0})
 
-    # Always redirect to https if HTTPS_ONLY is set (otherwise default to False)
+    # Handle https upgrade
     https_only = os.getenv('HTTPS_ONLY', False)
+    is_heroku = request.url.endswith('.herokuapp.com')
+    is_http = request.url.startswith('http://')
 
-    if https_only and request.url.startswith('http://'):
+    if (is_heroku and is_http) or (https_only and is_http):
         return redirect(request.url.replace('http://', 'https://', 1), code=308)
 
     g.user_config = Config(**session['config'])