Travis CI matrix: add 2.4, 2.5

Author: olleolleolle

.travis.yml

@@ -12,4 +12,6 @@ rvm:
 - 2.1.10
 - 2.2.5
 - 2.3.1
+- 2.4
+- 2.5
 script: rake travis

test/test_net_http_persistent.rb

@@ -120,7 +120,7 @@ def proxy_port
   def basic_connection
     raise "#{@uri} is not HTTP" unless @uri.scheme.downcase == 'http'
 
-    net_http_args = [@uri.host, @uri.port]
+    net_http_args = [@uri.hostname, @uri.port]
 
     connection = Net::HTTP::Persistent::Connection.allocate
     connection.ssl_generation = @http.ssl_generation
@@ -152,7 +152,7 @@ def r.read_body() :read_body end
   def ssl_connection
     raise "#{@uri} is not HTTPS" unless @uri.scheme.downcase == 'https'
 
-    net_http_args = [@uri.host, @uri.port]
+    net_http_args = [@uri.hostname, @uri.port]
 
     connection = Net::HTTP::Persistent::Connection.allocate
     connection.ssl_generation = @http.ssl_generation