upgrade relx and bbmustache

rebar.config

@@ -5,8 +5,8 @@
         {ssl_verify_hostname, "1.0.5"},
         {providers,       "1.4.1"},
         {getopt,          "0.8.2"},
-        {bbmustache,      "1.0.3"},
-        {relx,            "3.4.0"}]}.
+        {bbmustache,      "1.0.4"},
+        {relx,            "3.5.0"}]}.
 
 {escript_name, rebar3}.
 {escript_emu_args, "%%! +sbtu +A0\n"}.

rebar.lock

@@ -1,6 +1,6 @@
-[{<<"bbmustache">>,{pkg,<<"bbmustache">>,<<"1.0.3">>},0},
+[{<<"bbmustache">>,{pkg,<<"bbmustache">>,<<"1.0.4">>},0},
  {<<"erlware_commons">>,{pkg,<<"erlware_commons">>,<<"0.15.0">>},0},
  {<<"getopt">>,{pkg,<<"getopt">>,<<"0.8.2">>},0},
  {<<"providers">>,{pkg,<<"providers">>,<<"1.4.1">>},0},
- {<<"relx">>,{pkg,<<"relx">>,<<"3.4.0">>},0},
+ {<<"relx">>,{pkg,<<"relx">>,<<"3.5.0">>},0},
  {<<"ssl_verify_hostname">>,{pkg,<<"ssl_verify_hostname">>,<<"1.0.5">>},0}].