Add matrix to e2e.yaml

[codecov-commenter]

Codecov Report

Merging #169 (74d3bd1) into master (f85b316) will decrease coverage by 0.18%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   64.85%   64.67%   -0.19%     
==========================================
  Files          22       22              
  Lines        1104     1104              
==========================================
- Hits          716      714       -2     
- Misses        334      335       +1     
- Partials       54       55       +1     

Impacted Files	Coverage Δ
sampler.go	78.68% <0.00%> (-3.28%)	:arrow_down:

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