Clean up CHANGELOG_PENDING (#716)

CHANGELOG_PENDING.md

@@ -1,14 +1,3 @@
 ### Improvements
 
-- [sdk] #553: Added `com.pulumi.test` package with new idiomatic Java API for [unit testing Pulumi programs]
-  (https://www.pulumi.com/docs/guides/testing/#unit-testing) against mocks.
-  See ([example](https://github.com/pulumi/pulumi-java/tree/main/tests/examples/testing-unit-java)) of using the new API.
-
-- [codegen] [#709](https://github.com/pulumi/pulumi-java/pull/709)
-  Improved version handling in `pulumi-java-gen`: now `--version`
-  argument is optional and the version of the generated package need
-  not be known at SDK code generation time and is not spliced into the
-  code. To set the version at build time use
-  `gradle -Pversion=1.2.3 build` or `PACKAGE_VERSION=1.2.3 gradle build`.
-
 ### Bug Fixes