add client env usage

README.md

@@ -19,7 +19,7 @@ Or install it yourself as:
 ## Basic Usage
 
 In your api file (somewhere on the top)
-    
+
     require 'grape_logging'
     logger.formatter = GrapeLogging::Formatters::Default.new
     use GrapeLogging::Middleware::RequestLogger, { logger: logger }
@@ -50,19 +50,24 @@ You can include logging of other parts of the request / response cycle by includ
       use GrapeLogging::Middleware::RequestLogger,
         logger: logger,
         include: [ GrapeLogging::Loggers::Response.new,
-                   GrapeLogging::Loggers::FilterParameters.new ]
+                   GrapeLogging::Loggers::FilterParameters.new,
+                   GrapeLogging::Loggers::ClientEnv.new ]
     end
 
+#### FilterParameters
 The `FilterParameters` logger will filter out sensitive parameters from your logs. If mounted inside rails, will use the `Rails.application.config.filter_parameters` by default. Otherwise, you must specify a list of keys to filter out.
 
+#### ClientEnv
+The `FilterParameters` logger will add `ip` and user agent `ua` in your log.
+
 ### Logging to file and STDOUT
 
 You can log to file and STDOUT at the same time, you just need to assign new logger
-    
+
     log_file = File.open('path/to/your/logfile.log', 'a')
     log_file.sync = true
     logger Logger.new GrapeLogging::MultiIO.new(STDOUT, log_file)
-    
+
 ### Logging via Rails instrumentation
 
 You can choose to not pass the logger to ```grape_logging``` but instead send logs to Rails instrumentation in order to let Rails and its configured Logger do the log job, for example.
@@ -74,16 +79,16 @@ First, config ```grape_logging```, like that:
         include: [ GrapeLogging::Loggers::Response.new,
                    GrapeLogging::Loggers::FilterParameters.new ]
     end
-    
+
 and then add an initializer in your Rails project:
-    
+
     # config/initializers/instrumentation.rb
-    
+
     # Subscribe to grape request and log with Rails.logger
     ActiveSupport::Notifications.subscribe('grape_key') do |name, starts, ends, notification_id, payload|
       Rails.logger.info payload
     end
-   
+
 The idea come from here: https://gist.github.com/teamon/e8ae16ffb0cb447e5b49
 
 ### Logging exceptions