Clear release notes (#23)

Author: llucax

RELEASE_NOTES.md

@@ -2,12 +2,16 @@
 
 ## Summary
 
-This release add some symbols that were missing from the public API:
-
-+ `ComponentCategory`
-+ `ComponentMetadata`
-+ `ComponentMetricId`
-+ `ComponentType`
-+ `Fuse`
-+ `GridMetadata`
-+ `InverterType`
+<!-- Here goes a general summary of what this release is about -->
+
+## Upgrading
+
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+
+## New Features
+
+<!-- Here goes the main new features and examples or instructions on how to use them -->
+
+## Bug Fixes
+
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->