added missing submodule

Matěj Sychra · Matěj Sychra · commit 230da6d77d3c · 2018-05-13T20:56:17.000+02:00
diff --git a/.gitmodules b/.gitmodules
@@ -12,4 +12,4 @@
 	url = git@github.com:suculent/thinx-firmware-esp32.git
 [submodule "lib/esp32-http-update"]
 	path = lib/esp32-http-update
-	url = git@github.com:suculent/esp32-http-update.git
+	url = https://github.com/suculent/esp32-http-update
