Pin power_assert to 1.2 series (#1678)

`power_assert` recently released version 2.0 which caused some issues on older versions of Ruby. Pin to 1.2 for now until we deprecate support for older versions of Ruby.
rouge-ruby · Feb 12, 2021 · 442c8f4 · 442c8f4
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commit 442c8f4
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diff --git a/Gemfile b/Gemfile
@@ -8,6 +8,7 @@ gem 'rake'
 
 gem 'minitest', '>= 5.0'
 gem 'minitest-power_assert'
+gem 'power_assert', '~> 1.2'
 
 gem 'parallel', '~> 1.13.0' if RUBY_VERSION < '2.2.0'
 gem 'rubocop', '~> 0.49.1'