Update upgrading guidelines

tify-iiif-viewer · Nov 2, 2022 · 1d91c0c · 1d91c0c
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 ## Any prior release to v0.28
 
-- All default breakpoints have been modified, so TIFY’s layout may look different than before, depending on its container size. Change the `breakpoints` option if required.
+- Layout breakpoints have changed, so TIFY may show different interface elements than before, depending on its container size. Modify the `breakpoints` option if required.
+- If you are using a customized stylesheet, it probably needs updating.
 
 ## Any prior release to v0.27