added timers gem, and a timer group to the pool

httpx.gemspec

@@ -21,6 +21,7 @@ Gem::Specification.new do |gem|
   gem.version       = HTTPX::VERSION
 
   gem.add_runtime_dependency "http-2",              ">= 0.9.0"
+  gem.add_runtime_dependency "timers"
   gem.add_development_dependency "http-form_data",  ">= 2.0.0", "< 3"
   gem.add_development_dependency "http-cookie",     "~> 1.0"
 end

lib/httpx/pool.rb

@@ -1,14 +1,21 @@
 # frozen_string_literal: true
 
+require "forwardable"
+require "timers"
 require "httpx/selector"
 require "httpx/connection"
 require "httpx/resolver"
 
 module HTTPX
   class Pool
+    extend Forwardable
+
+    def_delegator :@timers, :after
+
     def initialize
       @resolvers = {}
       @_resolver_monitors = {}
+      @timers = Timers::Group.new
       @selector = Selector.new
       @connections = []
       @connected_connections = 0