Update changelog for v0.4.0

Author: bigdaz

release/changes.md

@@ -1,4 +1,6 @@
 Preliminary release of the github dependency graph plugin.
 
-- Added `SimpleDependencyGraphPlugin` which produces a generic depenency graph without requiring GitHub specific env vars (#34)
-- Removed spurious logging when configuration filters are applied (#66)
+- Renamed most input parameters for consistency, and avoiding direct reliance of GitHub-defined variables.
+- Reduced spurious logging when using `DEPENDENCY_GRAPH_INCLUDE_CONFIGURATIONS`.
+
+Note that all users of this plugin will need to be updated to accomodate the renamed input parameters.