fix: add kura to plt_extra_apps to resolve dialyzer warnings (#3)

kura is in optional_applications but plt_apps: all_deps doesn't
include optional apps automatically. Explicitly adding it removes
all 54 "unknown function/type" warnings.

Author: Taure

rebar.config

@@ -21,7 +21,8 @@
 
 {dialyzer, [
     {warnings, [error_handling, unmatched_returns, unknown]},
-    {plt_apps, all_deps}
+    {plt_apps, all_deps},
+    {plt_extra_apps, [kura]}
 ]}.
 
 {xref_checks, [undefined_function_calls, undefined_functions]}.