Submodules should use HTTPS git repo urls

Author: zrecore

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "libraries/RTCZero"]
 	path = libraries/RTCZero
-	url = git@github.com:femtoduino/RTCZero.git
+	url = https://github.com/femtoduino/RTCZero.git
 [submodule "libraries/atmel-lwm"]
 	path = libraries/atmel-lwm
-	url = git@github.com:femtoduino/library-atmel-lwm.git
+	url = https://github.com/femtoduino/library-atmel-lwm.git