Topics/custom should update scroll

[Rusta]

Adds support for overriding the 'shouldUpdateScroll' function when changing between routes

[KyleAMathews]

Nit picky but could the default function name be "defaultShouldUpdateScroll"?

[Rusta]

sure, no problem - I've updated the function name as per your suggestion

[KyleAMathews]

Perfect! Will merge and release, thanks!

[jlengstorf]

Hiya @Rusta! 👋

This is definitely late, but on behalf of the entire Gatsby community, I wanted to say thank you for being here.

Gatsby is built by awesome people like you. Let us say “thanks” in two ways:

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