Bump version to 0.4.0

Signed-off-by: Sahas Subramanian <sahas.subramanian@proton.me>

Author: shsms

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "frequenz-microgrid"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 description = "A high-level interface to the Frequenz Microgrid API."
 repository = "https://github.com/frequenz-floss/frequenz-microgrid-rs"

RELEASE_NOTES.md

@@ -1,9 +1,5 @@
 # Frequenz Microgrid Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
 ## Upgrading
 
 - This updates the component-graph version to 0.5, which treats unhandled component categories as pass-through.
@@ -17,12 +13,11 @@
 - The microgrid client now tolerates the API server being absent or returning incomplete data at startup. `MicrogridClientHandle::try_new` establishes the gRPC connection lazily, so it succeeds regardless of whether the server is reachable; transient stream errors are then handled by the existing per-stream retry loop. `LogicalMeterHandle::try_new` (and therefore `Microgrid::try_new`) wraps the entire component-graph setup — listing components, listing connections, and building the graph — in a single retry loop that sleeps 3 seconds between attempts, so applications block waiting for the server and a valid graph instead of exiting with an error.
 
 - `Bounds::combine_parallel`, `Bounds::intersect`, and `Bounds::merge_if_overlapping` are now public, allowing external callers to combine bounds without going through higher-level types.
-- Put test utils under a feature gate.
+
+- Expose test utils behind the `test-utils` feature gate.
+
 - Added `MockMicrogridApiClient::augment_electrical_component_bounds`: It captures requests so that these can be used in test cases. Obtain the list of captured requests using `MockMicrogridApiClient::augment_bounds_calls_handle` (also new).
+
 - Added `MockComponent.add_component_bounds`: It allows to add metric bounds to a mock component.
 
 - `LogicalMeterConfig::with_component_graph_config` lets callers pass a custom `ComponentGraphConfig` to the underlying graph builder (e.g. to enable phantom loads in the consumer formula or to flip the meter-vs-device preference for per-category formulas).
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->