use http git submodule for WorldBuilder

The submodule is currently specified to use ssh. When somebody clones aspect with ``git clone --recursive https://github.com/geodynamics/aspect`` it will try to fetch the world builder using ssh (and ask for authentication or fail). Change this. I don't see any disadvantage of doing so.
geodynamics · Apr 6, 2019 · 4dc6007 · 4dc6007
1 parent 95a55e9
commit 4dc6007
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "contrib/WorldBuilder"]
 	path = contrib/WorldBuilder
-	url = git@github.com:GeodynamicWorldBuilder/WorldBuilder.git
+	url = https://github.com/GeodynamicWorldBuilder/WorldBuilder.git