docs(book): submodule use https rather than git

amejiarosario · amejiarosario · commit e3dc5596dda6 · 2019-06-22T10:00:12.000-04:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "book/config"]
 	path = book/config
-	url = git@github.com:amejiarosario/dsa.js-private.git
+	url = https://github.com/amejiarosario/dsa.js-private.git
