Активировать запуск RuboCop в Travis CI после исправления ошибок в работе с образом ruby-2.5:alpine

[gruz0]

1. 2.5 alpine thread stack size/level docker-library/ruby#196
2. SystemStackError occurred at Docker image ruby:2.5.0-alpine3.7 rubocop/rubocop#5341

Сейчас запуск RuboCop падает с ошибкой:

test_1  | /usr/local/bundle/gems/rubocop-0.58.2/lib/rubocop/ast/node.rb:183:in `each': stack level too deep (SystemStackError)
test_1  |       from /usr/local/bundle/gems/rubocop-0.58.2/lib/rubocop/ast/node.rb:183:in `each_child_node'
test_1  |       from /usr/local/bundle/gems/rubocop-rspec-1.27.0/lib/rubocop/rspec/example_group.rb:39:in `each'
test_1  |       from /usr/local/bundle/gems/rubocop-rspec-1.27.0/lib/rubocop/rspec/example_group.rb:39:in `flat_map'
test_1  |       from /usr/local/bundle/gems/rubocop-rspec-1.27.0/lib/rubocop/rspec/example_group.rb:39:in `subjects_in_scope'
test_1  |       from /usr/local/bundle/gems/rubocop-rspec-1.27.0/lib/rubocop/rspec/example_group.rb:50:in `find_subjects'
test_1  |       from /usr/local/bundle/gems/rubocop-rspec-1.27.0/lib/rubocop/rspec/example_group.rb:40:in `block in subjects_in_scope'
test_1  |       from /usr/local/bundle/gems/rubocop-0.58.2/lib/rubocop/ast/node.rb:185:in `block in each_child_node'
test_1  |       from /usr/local/bundle/gems/rubocop-0.58.2/lib/rubocop/ast/node.rb:183:in `each'
test_1  |        ... 147 levels...
test_1  |       from /usr/local/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
test_1  |       from /usr/local/bundle/gems/rubocop-0.58.2/exe/rubocop:12:in `<top (required)>'
test_1  |       from /usr/local/bundle/bin/rubocop:23:in `load'
test_1  |       from /usr/local/bundle/bin/rubocop:23:in `<main>'