Version 0.19.1

• [FIX] Reverting #914. It broke existing behavior and prevented array type arguments.
  (#937)
• [FIX] Add test for accepting array as parameter based on wsdl (#933)
• [DOC] readme.md clarifications, examples and typos (#930)
• [MAINTENANCE] Fix build by satisfying jshint indentation (#931)
• [MAINTENANCE] Drop travis-ci test support for node.js < 4.x (LTS) (#932)
• [DOC] Update CONTRIBUTING.md
• [DOC] typo in server example (#925)