Prepare release notes for 1.0.0-rc5 (#884)

Author: llucax

RELEASE_NOTES.md

@@ -2,17 +2,12 @@
 
 ## Summary
 
-<!-- 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 -->
+This is a minor non-breaking release that adds new features and fixes a few bug.
 
 ## New Features
 
 - Allow multiplying and dividing any `Quantity` by a `float`. This just scales the `Quantity` value.
 - Allow dividing any `Quantity` by another quaintity of the same type. This just returns a ration between both quantities.
-
 - The battery pool `power` method now supports scenarios where one or more inverters can have multiple batteries connected to it and one or more batteries can have multiple inverters connected to it.
 
 ## Bug Fixes