Fix whitespace issues with resizing

[mrz1988]

Summary

• Rev version to 0.3.0 for release
• Fix tests that didn't account for adding filler whitespace on a width=-1 resize
• Add filler whitespace after vertical resizing on width=-1 resizes
• Adjust test to account for vertical resizing removing the longest row

[codecov[bot]]

Codecov Report

Merging #56 (f3ca8e6) into master (f1e6b24) will decrease coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   91.17%   91.06%   -0.11%     
==========================================
  Files          36       36              
  Lines        1825     1825              
  Branches      302      302              
==========================================
- Hits         1664     1662       -2     
- Misses        134      135       +1     
- Partials       27       28       +1     

Impacted Files	Coverage Δ
lilies/__init__.py	81.81% <100.00%> (ø)
lilies/api/resize.py	95.74% <100.00%> (-2.13%)	:arrow_down:

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