Release/v0.8.1

[leewujung]

This PR contains all changes in release v0.8.1.

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Codecov Report

Merging #1157 (09e2705) into main (254ee10) will increase coverage by 2.56%. The diff coverage is 93.82%.

@@            Coverage Diff             @@
##             main    #1157      +/-   ##
==========================================
+ Coverage   79.78%   82.35%   +2.56%     
==========================================
  Files          65       64       -1     
  Lines        6011     5803     -208     
==========================================
- Hits         4796     4779      -17     
+ Misses       1215     1024     -191     

Flag	Coverage Δ
unittests	82.35% <93.82%> (+2.56%)	:arrow_up:

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Files Changed	Coverage Δ
echopype/echodata/echodata.py	78.59% <ø> (-3.47%)	:arrow_down:
echopype/convert/set_groups_base.py	86.70% <88.88%> (+0.13%)	:arrow_up:
echopype/mask/freq_diff.py	93.44% <93.44%> (ø)
echopype/convert/set_groups_azfp.py	97.67% <100.00%> (+0.05%)	:arrow_up:
echopype/convert/set_groups_ek60.py	100.00% <100.00%> (ø)
echopype/convert/set_groups_ek80.py	97.57% <100.00%> (+0.01%)	:arrow_up:
echopype/mask/api.py	93.33% <100.00%> (+5.83%)	:arrow_up:

... and 4 files with indirect coverage changes

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