Merge pull request #89 from sebsjames/87-submodule-maths-https

Use the authentication-free https path to the maths submodule.

Thanks for raising the issue @elegracer

Author: sebsjames

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "maths"]
 	path = maths
-	url = git@github.com:sebsjames/maths
+	url = https://github.com/sebsjames/maths