Add changelog and upgrade for 5.3.0

Author: codejudas

CHANGES.md

@@ -3,18 +3,16 @@ twilio-ruby changelog
 
 [2017-09-29] Version 5.3.0
 ---------------------------
-**Api**
-- [omit] Added hidden fields for SMS experimentation
-
 **Chat**
 - Make member accessible through identity
 - Make channel subresources accessible by channel unique name
 - Set get list 'max_page_size' parameter to 100
 - Add service instance webhook retry configuration
 - Add media message capability
+- Make `body` an optional parameter on Message creation. *(breaking change)*
 
 **Notify**
-- `data`, `apn`, `gcm`, `fcm`, `sms` parameters in `Notifications` create resource are objects instead of strings. *(breaking change)*
+- `data`, `apn`, `gcm`, `fcm`, `sms` parameters in `Notifications` create resource now accept objects (hashes) instead of strings. Passing manually stringified json will continue to work.
 
 **Taskrouter**
 - Add new query ability by TaskChannelSid or TaskChannelUniqueName

UPGRADE.md

@@ -0,0 +1,30 @@
+# Upgrade Guide
+
+_After `5.0.0` all `MINOR` and `MAJOR` version bumps will have upgrade notes
+posted here._
+
+[2017-09-29] 5.x.x to 5.3.x
+---------------------------
+
+### CHANGED - `Body` parameter on Chat `Message` creation is no longer required.
+
+#### Rationale
+This was changed to add support for sending media in Chat messages, users can now either provide a `body` or a `media_sid`.
+
+#### 5.x.x
+```ruby
+require 'twilio-ruby'
+
+@client = Twilio::REST::Client.new "AC123", "auth"
+@client.chat.v2.service('IS123').channel('CH123').message.create("this is the body", "from")
+```
+
+#### 5.3.x
+```ruby
+require 'twilio-ruby'
+
+@client = Twilio::REST::Client.new "AC123", "auth"
+@client.chat.v2.service('IS123').channel('CH123').message.create("from", body:"this is the body")
+```
+
+