fix(logging): fix spelling of graylog

config/postal.defaults.yml

@@ -34,7 +34,7 @@ logging:
   root: # Automatically determined based on config root
   max_log_file_size: 20
   max_log_files: 10
-  greylog:
+  graylog:
     host:
     port: 12201
 

lib/postal/app_logger.rb

@@ -11,7 +11,7 @@ module Postal
 
     def add(severity, message = nil, progname = nil)
       super
-      if severity >= @level && n = self.class.greylog_notifier
+      if severity >= @level && n = self.class.graylog_notifier
         begin
           if message.nil?
             message = block_given? ? yield : progname
@@ -26,12 +26,12 @@ module Postal
       true
     end
 
-    def self.greylog?
-      !!Postal.config.logging.greylog&.host
+    def self.graylog?
+      !!Postal.config.logging.graylog&.host
     end
 
-    def self.greylog_notifier
-      @greylog_notifier ||= greylog? ? GELF::Notifier.new(Postal.config.logging.greylog.host, Postal.config.logging.greylog.port) : nil
+    def self.graylog_notifier
+      @graylog_notifier ||= graylog? ? GELF::Notifier.new(Postal.config.logging.graylog.host, Postal.config.logging.graylog.port) : nil
     end
   end