make end attribute not required

docs/1.0.md

@@ -1011,7 +1011,7 @@ The function of `<guid>` within a live item tag is the same as it is within a re
  - **status** (required) A string that must be one of `pending`, `live` or `ended`.
  - **start** (required) A string representing an ISO8601 timestamp that denotes the time when the stream is intended 
    to start.
- - **end** (required) A string representing an ISO8601 timestamp that denotes the time when the stream is intended 
+ - **end** (recommended) A string representing an ISO8601 timestamp that denotes the time when the stream is intended 
    to end.
 
 The `start` and `end` attributes denote when the live stream "should" start and end.  But, real life dictates that