Update docs to reflect label-wrap feature

[feluelle]

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[codecov-commenter]

Codecov Report

Merging #20 (1a7714a) into master (dbe9c6b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   96.37%   96.37%           
=======================================
  Files           6        6           
  Lines         193      193           
=======================================
  Hits          186      186           
  Misses          7        7           

Impacted Files	Coverage Δ
airflow_diagrams/cli.py	97.91% <ø> (ø)

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