Remove old OSS projects from open-source.md

Fixes cloudevents#1242

Signed-off-by: Doug Davis <dug@microsoft.com>

docs/open-source.md

@@ -1,27 +1,9 @@
 If you have created (or know of) an open source library or product that uses
-CloudEvents, please include in the list below.
+CloudEvents v1.0, please include it in the list below.
 
-- [CloudEvents.NET](https://github.com/aliencube/CloudEvents.NET): is a .NET
-  implementation of the CloudEvents [spec](../cloudevents/spec.md) and
-  [HTTP protocol binding](../cloudevents/bindings/http-protocol-binding.md). It has been released to
-  [nuget.org](https://www.nuget.org/packages?q=Aliencube.CloudEventsNet). It
-  also contains some app
-  [samples](https://github.com/aliencube/CloudEvents.NET/tree/master/sample)
-  of 1) console app to Web API, and 2) Web API to Azure Event Grid, which
-  demonstrates how CloudEvent messages are generated and sent to Web API and
-  Azure Event Grid over HTTP.
-- [microBean CloudEvents](https://microbean.github.io/microbean-cloudevents/):
-  CloudEvents represented as plain Java objects. Satellite projects add
-  [Jackson and CDI event integration](https://microbean.github.io/microbean-cloudevents-jackson-cdi).
-- [jCloudEvents](https://github.com/project-streamzi/jcloudevents): Java POJO
-  implementation of the CloudEvents specification and some CDI bindings.
-- [Strombrau Gateway](https://github.com/project-streamzi/event-gateway): Vert.x
-  based gateway routing CloudEvent metadata to internal Apache Kafka topic
-- [Event Gateway](https://github.com/serverless/event-gateway): It's dataflow
-  for event-driven, serverless architectures. The Event Gateway combines both
-  API Gateway and Pub/Sub functionality into a single event-driven experience.
 - [CloudEvents Extend API](https://github.com/goextend/cloudevents-extend-api)
-  is a JavaScript programming model for Extend which allows handling CloudEvents.
+  is a JavaScript programming model for Extend which allows handling
+  CloudEvents.
 - [CloudEvents Verify](https://github.com/btbd/CEVerify): is a tool to help
   verify CloudEvents according to the proper specifications. It is currently
   being hosted publicly [here](http://soaphub.org/ceverify).