cannonical -> canonical

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

[ci skip]

Closes #3649

[ci skip]

[ci skip]

Closes #2837

**Why is this needed?**
It just does look better in the Readme :-)

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

This reverts commit 8a01a122.