Fix bug for invalid error

The errors value was not properly assigned due to calling wrong method

Author: Sebastian Wilgosz

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    jsonapi_errors_handler (0.1.1)
+    jsonapi_errors_handler (0.1.2)
 
 GEM
   remote: https://rubygems.org/
@@ -32,4 +32,4 @@ DEPENDENCIES
   rspec (~> 3.0)
 
 BUNDLED WITH
-   1.16.6
+   1.17.3

lib/jsonapi_errors_handler/errors/standard_error.rb

@@ -13,7 +13,7 @@ def initialize(title: nil, detail: nil, status: nil, source: {})
         @source = KeysStringifier.call(source)
       end
 
-      def to_h
+      def serializable_hash
         {
           status: status,
           title: title,
@@ -22,12 +22,12 @@ def to_h
         }
       end
 
-      def serializable_hash
-        to_h
+      def to_h
+        serializable_hash
       end
 
       def to_s
-        to_h.to_s
+        serializable_hash.to_s
       end
 
       attr_reader :title, :detail, :status, :source