Rename master -> main

[basnijholt]

Description

Updates references from master to main.

Fixes #383.

Tagging @loganbvh

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #384 (fdacd03) into main (e3ec0b2) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
- Coverage   77.72%   77.66%   -0.06%     
==========================================
  Files          37       37              
  Lines        5422     5422              
  Branches      981      981              
==========================================
- Hits         4214     4211       -3     
- Misses       1061     1063       +2     
- Partials      147      148       +1     

Impacted Files	Coverage Δ
adaptive/learner/average_learner1D.py	74.08% <0.00%> (-0.67%)	⬇️
adaptive/learner/learner1D.py	86.73% <0.00%> (-0.25%)	⬇️

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