Update to PrettyTables.jl v3

[juliohm]

Recently announced: https://discourse.julialang.org/t/ann-prettytables-v3-0-0/131821

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.33%. Comparing base (982ccef) to head (ac3cfb7).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/abstractgeotable.jl	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
- Coverage   86.60%   86.33%   -0.27%     
==========================================
  Files          22       22              
  Lines         963      959       -4     
==========================================
- Hits          834      828       -6     
- Misses        129      131       +2     

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