include cache (coingecko#1409)

fix gem error when included in Rails

lib/cryptoexchange.rb

@@ -1,7 +1,6 @@
 require "cryptoexchange/version"
 require "cryptoexchange/credentials"
 require "cryptoexchange/client"
-require "cryptoexchange/lru_ttl_cache"
 require "cryptoexchange/helpers/string_helper"
 require "cryptoexchange/helpers/numeric_helper"
 require "cryptoexchange/helpers/hash_helper"
@@ -14,16 +13,18 @@
 require "cryptoexchange/services/trade_stream"
 require "cryptoexchange/services/order_book_stream"
 require "cryptoexchange/services/authentication"
-require "cryptoexchange/config"
 
 path_files = Dir[File.join(File.dirname(__dir__), 'lib', 'cryptoexchange', '**', '*.rb')]
 
 path_files.sort_by!{ |file_name| file_name.downcase }.each do |path|
   require_relative path
 end
 
-Cryptoexchange.reset_config
-
 require "http"
 require "lru_redux"
 require "websocket-eventmachine-client"
+require "cryptoexchange/config"
+require "cryptoexchange/lru_ttl_cache"
+require "cryptoexchange/cache"
+
+Cryptoexchange.reset_config

lib/cryptoexchange/cache.rb

@@ -1,5 +1,3 @@
-require "pry"
-
 module Cryptoexchange
   class Cache
     attr_accessor :cache_instance