Update docs for inline images

Author: Rich Leland

sparkpost/transmissions.py

@@ -181,6 +181,26 @@ def send(self, **kwargs):
                     name='document.pdf',
                     filename='/full/path/to/document.pdf'
                 )
+        :param inline_images: List of dicts. For example:
+
+            .. code-block:: python
+
+                dict(
+                    type='image/png',
+                    name='imageCID',
+                    data='base64 encoded string'
+                )
+
+            Replace `data` with `filename` if you want the library to perform
+            the base64 conversion. For example:
+
+            .. code-block:: python
+
+                dict(
+                    type='image/png',
+                    name='imageCID',
+                    filename='/full/path/to/image.png'
+                )
 
         :param str start_time: Delay generation of messages until this
             datetime. Format YYYY-MM-DDTHH:MM:SS+-HH:MM. Example:

test/test_transmissions.py

@@ -189,7 +189,7 @@ def test_success_send_with_inline_images():
     sp = SparkPost('fake-key')
 
     image_data = {
-        "name": "sparkpostdev.png",
+        "name": "sparkpostdev",
         "type": "image/png",
         "filename": image_path
     }
@@ -201,8 +201,8 @@ def test_success_send_with_inline_images():
     assert results == 'yay'
 
     image_data = {
-        "name": "test.txt",
-        "type": "text/plain",
+        "name": "sparkpostdev",
+        "type": "image/png",
         "data": encoded_image
     }
     results = sp.transmission.send(inline_images=[image_data])