README.md in net-http-middleware-0.1.0 vs README.md in net-http-middleware-0.2.0

@@ -2,37 +2,43 @@
 
 Middlewares for Net::HTTP request method.
 
 ## Usage
 
+There are couple of requirements for middleware to be implemented
+1. Chain as a first argument for initializer of your middleware
+2. 2 params for call: Request-object and body to be passed to call
+3. Return the result of @chain.call(req, body)
+
 ```ruby
 # Example of tracer, which will add header to each outgoing request
 class OpenTraceId
   def initialize(chain)
     @chain = chain
   end
 
-  def call(req, body = nil, &block)
+  def call(req, body = nil)
     request.add_field('X-Custom-CrossService-RequestId', SecureRandom.uuid)
-    @chain.call(req, body, block)
+    @chain.call(req, body)
   end
 end
 
 # Example of Loging for 
 class LogRequest
   def initialize(chain, logger)
     @chain = chain
     @logger = logger
   end
 
-  def call(req, body = nil, &block)
+  def call(req, body = nil)
     @logger.info('We log before')
-    response = @chain.call(req, body, block)
+    response = @chain.call(req, body)
     @logger.info('We log after')
     response
   end
 end
 
+require 'net/http/middleware'
 # Adding middlewares to configurator
 Net::HTTP.configure_middleware do |chain|
   chain.use LogRequest, Logger.new(STDOUT)
   chain.use OpenTraceId
 end