update task and Rakefile

Rakefile

@@ -1,14 +1,15 @@
 
 begin
-  require "#{dir = File.dirname(__FILE__)}/task/gemgem"
+  require "#{__dir__}/task/gemgem"
 rescue LoadError
   sh 'git submodule update --init --recursive'
   exec Gem.ruby, '-S', $PROGRAM_NAME, *ARGV
 end
 
-Gemgem.init(dir) do |s|
+Gemgem.init(__dir__) do |s|
   require 'promise_pool/version'
   s.name    = 'promise_pool'
   s.version = PromisePool::VERSION
+
   s.add_runtime_dependency('timers', '>=4.0.1')
 end

promise_pool.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib".freeze]
   s.authors = ["Lin Jen-Shin (godfat)".freeze]
-  s.date = "2016-07-21"
+  s.date = "2016-11-17"
   s.description = "promise_pool is a promise implementation backed by threads or threads pool.".freeze
   s.email = ["godfat (XD) godfat.org".freeze]
   s.files = [
@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   "test/test_timer.rb".freeze]
   s.homepage = "https://github.com/godfat/promise_pool".freeze
   s.licenses = ["Apache License 2.0".freeze]
-  s.rubygems_version = "2.6.6".freeze
+  s.rubygems_version = "2.6.8".freeze
   s.summary = "promise_pool is a promise implementation backed by threads or threads pool.".freeze
   s.test_files = [
   "test/test_future.rb".freeze,