Add dependabot schedule day

[mfvanek]

Relates to mfvanek/image-resizing#71

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7e2f058) 78.69% compared to head (8c6f8eb) 78.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   78.69%   78.69%           
=======================================
  Files          40       40           
  Lines         812      812           
  Branches       47       47           
=======================================
  Hits          639      639           
  Misses        138      138           
  Partials       35       35           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.