Added ETH currency to api.rb (#33)

Author: jasondcamp

blockcypher-ruby.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name        = 'blockcypher-ruby'
   s.summary     = 'Blockcypher Ruby SDK'
-  s.version     = '0.2.5'
+  s.version     = '0.2.6'
   s.licenses    = ['Apache 2.0']
   s.description = "Ruby library to help you build your crypto application on BlockCypher"
   s.summary     = "Ruby library to help you build your crypto application on BlockCypher"

lib/blockcypher/api.rb

@@ -5,7 +5,8 @@ module BlockCypher
   BTC = 'btc'
   LTC = 'ltc'
   DOGE = 'doge'
-  BCY= 'bcy'
+  BCY = 'bcy'
+  ETH = 'eth'
 
   MAIN_NET = 'main'
   TEST_NET = 'test'