Resolves 2 pandas warnings

[andrewfullard]

📝 Description

Type: 🪲 bugfix

There are a couple of Pandas futures warnings that cause a lot of trash log output. This PR resolves them. See also #417

🚦 Testing

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☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.69%. Comparing base (3403655) to head (c6f088c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   66.68%   66.69%           
=======================================
  Files          46       46           
  Lines        3497     3498    +1     
=======================================
+ Hits         2332     2333    +1     
  Misses       1165     1165           

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