Add more dialyzer checks (#55)

* Add more dialyzer checks

* Remove old OTP versions from CI

Author: elbrujohalcon

.github/workflows/erlang.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        otp: ['23.3', '24.3', '25.2.1']
+        otp: ['25.2.1']
         rebar: ['3.20.0']
 
     steps:

rebar.config

@@ -1,7 +1,7 @@
 {erl_opts,
  [warn_unused_import, warn_export_vars, warnings_as_errors, verbose, report, debug_info]}.
 
-{minimum_otp_vsn, "23"}.
+{minimum_otp_vsn, "25"}.
 
 {cover_enabled, true}.
 
@@ -10,11 +10,11 @@
 {deps, [{jiffy, "1.1.1"}]}.
 
 {dialyzer,
- [{warnings, [no_return, error_handling]},
+ [{warnings, [unknown, no_return, error_handling, missing_return, extra_return]},
   {plt_apps, top_level_deps},
   {plt_extra_apps, []},
   {plt_location, local},
-  {base_plt_apps, [erts, stdlib, kernel, inets, crypto, ssl]},
+  {base_plt_apps, [erts, stdlib, kernel, inets, crypto, ssl, xmerl]},
   {base_plt_location, global}]}.
 
 {xref_checks,