gitmodules: fix url to use https
diff --git a/.gitmodules b/.gitmodules
index 3abb82d..ad3f0c8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "third_party/make-env"]
 	path = third_party/make-env
-	url = git+ssh://github.com/SymbiFlow/make-env.git
+	url = https://github.com/SymbiFlow/make-env.git