Merge pull request #219 from darrensmith223/add-perf-substitution

Add perform_substitution

sparkpost/transmissions.py

@@ -25,6 +25,7 @@
     'skip_suppression': 'options/skip_suppression',
     'ip_pool': 'options/ip_pool',
     'inline_css': 'options/inline_css',
+    'perform_substitutions': 'options/perform_substitutions',
     'email_rfc822': 'content/email_rfc822',
     'custom_headers': 'content/headers',
     'use_draft_template': 'content/use_draft_template',
@@ -282,6 +283,8 @@ def send(self, **kwargs):
         :param str ip_pool: The ID of an IP pool associated with
             your account
         :param bool inline_css: Whether or not to perform CSS inlining
+        :param bool perform_substitutions: Whether or not to enable
+            substitutions (default is True)
         :param dict custom_headers: Used to set any headers associated with
             transmission. See `header notes
             <https://developers.sparkpost.com/api/transmissions.html#header-header-notes>`_