Replaces length/size by eachindex/axes

[blegat]

This resolves the following warnings in VSCode:

Indexing with indices obtained from length, size is discouraged. Use eachindex or axes instead.

[codecov]

Codecov Report

Base: 97.69% // Head: 97.69% // No change to project coverage 👍

Coverage data is based on head (0a211ec) compared to base (856dcc6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3149   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files          33       33           
  Lines        4460     4460           
=======================================
  Hits         4357     4357           
  Misses        103      103           

Impacted Files	Coverage Δ
src/print.jl	99.73% <100.00%> (ø)

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