Updated UPGRADING.md

Author: cmaglie

docs/UPGRADING.md

@@ -4,6 +4,8 @@ Here you can find a list of migration guides to handle breaking changes between
 
 ## 0.32.0
 
+### `arduino-cli` doesn't lookup anymore in the current directory for configuration file.
+
 Configuration file lookup in current working directory and its parents is dropped. The command line flag `--config-file`
 must be specified to use an alternative configuration file from the one in the data directory.
 
@@ -49,6 +51,10 @@ $ arduino-cli outdated --format json
 }
 ```
 
+### golang API: method `github.com/arduino/arduino-cli/arduino/libraries/Library.LocationPriorityFor` removed
+
+That method was outdated and must not be used.
+
 ## 0.31.0
 
 ### Added `post_install` script support for tools