Remove trailing whitespaces

rebar.config

@@ -4,28 +4,28 @@
             warn_export_all,
             warn_untyped_record,
             inline
-           ]}. 
+           ]}.
 
 {xref_checks, [
                fail_on_warning,
                undefined_function_calls
               ]}.
- 
+
 {clean_files, [".eunit/*", "ebin/*.beam"]}.
- 
+
 {cover_enabled, true}.
- 
+
 {edoc_opts, [
              {doclet, edown_doclet},
              {dialyzer_specs, all},
-             {report_missing_type, true}, 
+             {report_missing_type, true},
              {report_type_mismatch, true},
              {pretty_print, erl_pp},
              {preprocess, true}
             ]}.
 {validate_app_modules, true}.
- 
+
 {deps,
   [
-%%   {edown, ".*", {git, "git://github.com/sile/edown.git", {branch, "master"}}}
+   %% {edown, ".*", {git, "git://github.com/sile/edown.git", {branch, "master"}}}
   ]}.