deprecate ruby 2.5

[eguzki]

No description provided.

[codecov-commenter]

Codecov Report

Merging #307 (f0c8ada) into master (85966a1) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #307      +/-   ##
==========================================
- Coverage   98.57%   98.43%   -0.14%     
==========================================
  Files         343      343              
  Lines       16495    16256     -239     
==========================================
- Hits        16260    16002     -258     
- Misses        235      254      +19     

Impacted Files	Coverage Δ
lib/3scale_toolbox/crds/product_dump.rb	89.36% <0.00%> (-8.52%)	⬇️
...ox/commands/proxy_config_command/export_command.rb	92.30% <0.00%> (-5.13%)	⬇️
...oolbox/commands/policies_command/export_command.rb	84.90% <0.00%> (-3.78%)	⬇️
...ox/commands/proxy_config_command/deploy_command.rb	96.66% <0.00%> (-3.34%)	⬇️
...olbox/commands/application_command/list_command.rb	95.52% <0.00%> (-2.99%)	⬇️
...oolbox/commands/policies_command/import_command.rb	91.66% <0.00%> (-2.78%)	⬇️
...s/import_command/openapi/create_activedocs_step.rb	97.56% <0.00%> (-2.44%)	⬇️
...x/commands/policy_registry_command/copy_command.rb	93.61% <0.00%> (-2.13%)	⬇️
lib/3scale_toolbox/openapi/oas3.rb	95.83% <0.00%> (-2.09%)	⬇️
...nds/import_command/openapi/update_policies_step.rb	96.15% <0.00%> (-1.93%)	⬇️
... and 69 more

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