[update] 2.x upgrade

[rennokki]

https://github.com/renoki-co/php-k8s/releases/tag/2.0.0

[codecov]

Codecov Report

Merging #1 (889ddaf) into master (9cc4d8f) will decrease coverage by 0.21%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master       #1      +/-   ##
============================================
- Coverage     93.54%   93.33%   -0.22%     
  Complexity       18       18              
============================================
  Files             3        3              
  Lines            62       60       -2     
============================================
- Hits             58       56       -2     
  Misses            4        4              

Impacted Files	Coverage Δ	Complexity Δ
src/KubernetesCluster.php	91.30% <100.00%> (-0.37%)	15.00 <0.00> (ø)

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