Merge pull request #13 from maauer/patch-2

Add Canvas LMS as a Classroom Alternative

README.md

@@ -167,6 +167,7 @@ These Firefox extensions can help prevent connections to Google domains and also
 - Classroom
   - [Moodle](https://moodle.org/) - Self-hosted Classroom software for schools. Very powerful. Thanks @jankapunkt
   - [ILIAS](https://www.ilias.de/en/) - Another self-hosted open source classroom software. Thanks again to @jankapunkt
+  - [Canvas](https://www.instructure.com/canvas) Paid service by Instructure. Also avaliable as a [self hosted, open source option](https://github.com/instructure/canvas-lms). To ensure privacy, use the self-hosted option.
 - Maps/Street View
   - [OpenStreetMaps](https://www.openstreetmap.org/) **9-eyes** - Collaborative project to create a free, editable map of the world (from Wikipedia). Completely crowdsources. Very strong alternative to Maps.
   - *Editor note: I've seen OsmAnd: it's a mobile app. I've seen HERE WeGo: It's on malvertising filter lists.*