Diacritics in non-Latin alphabet strings are not stripped

[ianatha]

Version

5.2.0

Steps to reproduce

1. Load up https://codesandbox.io/s/gracious-dust-70ygq?file=/src/index.js
2. Type "μερα" (note no accent on lowercase epsilon)
3. Note that option "Καλημέρα" is not displayed

Expected Behavior

"καλημερα" (charcodes: [954, 945, 955, 951, 956, 941, 961, 945])

should match

"καλημέρα" (charcodes [])

when stripDiactrics is true

Actual Behavior

"καλημερα" did not match "καλημέρα"

Suggestion

Using something like str.normalize("NFD").replace(/[\u0300-\u036f]/g, "") may work better than the current stripDiactrics, although it's not supported in Internet Explorer and WebView Android.

[ericgio]

Addressed in v6.0.0-alpha.1