Fix rubocop warnings

[serprex]

Enable more

[codecov]

Codecov Report

Merging #215 (add106e) into master (de48c9f) will increase coverage by 0.04%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
+ Coverage   82.85%   82.90%   +0.04%     
==========================================
  Files          15       15              
  Lines         729      731       +2     
==========================================
+ Hits          604      606       +2     
  Misses        125      125              

Files	Coverage Δ
lib/activerecord-multi-tenant/copy_from_client.rb	42.85% <ø> (ø)
lib/activerecord-multi-tenant/fast_truncate.rb	100.00% <ø> (ø)
lib/activerecord-multi-tenant/habtm.rb	100.00% <100.00%> (ø)
lib/activerecord-multi-tenant/migrations.rb	62.68% <ø> (ø)
lib/activerecord-multi-tenant/model_extensions.rb	96.59% <100.00%> (+0.07%)	⬆️
lib/activerecord-multi-tenant/multi_tenant.rb	88.15% <ø> (ø)
lib/activerecord-multi-tenant/query_monitor.rb	76.92% <ø> (ø)
lib/activerecord-multi-tenant/query_rewriter.rb	92.30% <100.00%> (ø)
lib/activerecord-multi-tenant/sidekiq.rb	50.00% <ø> (ø)
lib/activerecord-multi-tenant/table_node.rb	100.00% <ø> (ø)
... and 1 more

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