upgrade eunit_formatters for OTP 18 support

rebar.config

@@ -10,7 +10,7 @@
         {relx,                "3.8.0"},
         {cf,                  "0.2.1"},
         {cth_readable,        "1.0.1"},
-        {eunit_formatters,    "0.2.0"}]}.
+        {eunit_formatters,    "0.3.0"}]}.
 
 {escript_name, rebar3}.
 {escript_emu_args, "%%! +sbtu +A0\n"}.

rebar.lock

@@ -3,7 +3,7 @@
  {<<"cf">>,{pkg,<<"cf">>,<<"0.2.1">>},0},
  {<<"cth_readable">>,{pkg,<<"cth_readable">>,<<"1.0.1">>},0},
  {<<"erlware_commons">>,{pkg,<<"erlware_commons">>,<<"0.16.0">>},0},
- {<<"eunit_formatters">>,{pkg,<<"eunit_formatters">>,<<"0.2.0">>},0},
+ {<<"eunit_formatters">>,{pkg,<<"eunit_formatters">>,<<"0.3.0">>},0},
  {<<"getopt">>,{pkg,<<"getopt">>,<<"0.8.2">>},0},
  {<<"providers">>,{pkg,<<"providers">>,<<"1.5.0">>},0},
  {<<"relx">>,{pkg,<<"relx">>,<<"3.8.0">>},0},