chore(lwm2m): bump version

apps/emqx_gateway_lwm2m/src/emqx_gateway_lwm2m.app.src

@@ -1,6 +1,6 @@
 {application, emqx_gateway_lwm2m, [
     {description, "LwM2M Gateway"},
-    {vsn, "0.1.1"},
+    {vsn, "0.1.2"},
     {registered, []},
     {applications, [kernel, stdlib, emqx, emqx_gateway, emqx_gateway_coap]},
     {env, []},