Merge pull request #53 from UncleGrumpy/doc-fix

Author: UncleGrumpy

.gitignore

@@ -7,3 +7,4 @@ _build
 _checkouts
 rebar3.crashdump
 erl_crash.dump
+doc

rebar.config

@@ -20,10 +20,10 @@
         <<"UPDATING.md">>,
         <<"LICENSE">>,
         <<"CONTRIBUTING.md">>,
-        <<"CODE_OF_CONDUCT.md">>
+        <<"CODE_OF_CONDUCT.md">>,
+        <<"SECURITY.md">>
     ]},
     {main, <<"README.md">>},
-    {output, "docs"},
     {api_reference, true},
     {skip_undefined_reference_warnings_on, ["README.md"]}
 ]}.