gem: support date format used by OpenVPN 2.5

- smooth fallback

spec/spec_helper.rb

@@ -16,6 +16,11 @@ def status_v2
   OpenVPNStatusWeb::Parser::V2.new.parse_status_log text
 end
 
+def status_2_5_v2
+  text = File.binread('examples/status2_5.v2')
+  OpenVPNStatusWeb::Parser::V2.new.parse_status_log text
+end
+
 def status_v3
   text = File.binread('examples/status.v3')
   OpenVPNStatusWeb::Parser::V3.new.parse_status_log text