Enhancement: Show diff

[localheinz]

This PR

• shows the diff after downloading the schema

Follows #288.

[codecov]

Codecov Report

Merging #291 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #291   +/-   ##
=========================================
  Coverage     84.94%   84.94%           
  Complexity       37       37           
=========================================
  Files             3        3           
  Lines           186      186           
=========================================
  Hits            158      158           
  Misses           28       28

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