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ShellCheck plugin for SonarQube

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Use '[:lower:]' to support accents and foreign alphabets.
Problematic code
PLATFORM="$(uname -s | tr 'A-Z' 'a-z')"

Correct code
PLATFORM="$(uname -s | tr '[:upper:]' '[:lower:]')"

Rationale
A-Z and a-z are commonly intended to mean "all uppercase" and "all lowercase letters" respectively. This ignores accented characters in English, and foreign characters in other languages:
$ tr 'a-z' 'A-Z' <<< "My fiancée ordered a piña colada."
MY FIANCéE ORDERED A PIñA COLADA.

Instead, you can use [:lower:] and [:upper:] to explicitly specify case:
$ tr '[:lower:]' '[:upper:]' <<< "My fiancée ordered a piña colada."
MY FIANCÉE ORDERED A PIÑA COLADA.

Exceptions
If you don't want a-z to match é or A-Z to match Ñ, you can ignore this message.
Note that the examples used here are multibyte characters in UTF-8. Many implementations (including GNU) fails to deal with them.