[rubygems/rubygems] Fix RuboCop offenses

These offenses appear when you create a gem with
`bundle gem foo` and run `rubocop` over it.

Initially, there were around 45 offenses detected,
but with #3731 and this, the number of offenses
have been reduced to 2.

Signed-off-by: Utkarsh Gupta <utkarsh@debian.org>

https://github.com/rubygems/rubygems/commit/fe9dcaa1b4

lib/bundler/templates/newgem/Gemfile.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 # Specify your gem's dependencies in <%= config[:name] %>.gemspec

lib/bundler/templates/newgem/Rakefile.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 <% default_task_names = [config[:test_task]].compact -%>
 <% case config[:test] -%>
@@ -27,7 +29,7 @@ RuboCop::RakeTask.new
 <% default_task_names.unshift(:clobber, :compile) -%>
 require "rake/extensiontask"
 
-task :build => :compile
+task build: :compile
 
 Rake::ExtensionTask.new("<%= config[:underscored_name] %>") do |ext|
   ext.lib_dir = "lib/<%= config[:namespaced_path] %>"

lib/bundler/templates/newgem/bin/console.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #!/usr/bin/env ruby
 
 require "bundler/setup"

lib/bundler/templates/newgem/lib/newgem.rb.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "<%= config[:namespaced_path] %>/version"
 <%- if config[:ext] -%>
 require "<%= config[:namespaced_path] %>/<%= config[:underscored_name] %>"

lib/bundler/templates/newgem/lib/newgem/version.rb.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 <%- config[:constant_array].each_with_index do |c, i| -%>
 <%= "  " * i %>module <%= c %>
 <%- end -%>

lib/bundler/templates/newgem/newgem.gemspec.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "lib/<%=config[:namespaced_path]%>/version"
 
 Gem::Specification.new do |spec|
@@ -6,8 +8,8 @@ Gem::Specification.new do |spec|
   spec.authors       = [<%= config[:author].inspect %>]
   spec.email         = [<%= config[:email].inspect %>]
 
-  spec.summary       = %q{TODO: Write a short summary, because RubyGems requires one.}
-  spec.description   = %q{TODO: Write a longer description or delete this line.}
+  spec.summary       = "TODO: Write a short summary, because RubyGems requires one."
+  spec.description   = "TODO: Write a longer description or delete this line."
   spec.homepage      = "TODO: Put your gem's website or public repo URL here."
 <%- if config[:mit] -%>
   spec.license       = "MIT"
@@ -22,9 +24,7 @@ Gem::Specification.new do |spec|
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files         = Dir.chdir(File.expand_path("..", __FILE__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  end
+  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]

lib/bundler/templates/newgem/spec/newgem_spec.rb.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 RSpec.describe <%= config[:constant_name] %> do
   it "has a version number" do
     expect(<%= config[:constant_name] %>::VERSION).not_to be nil

lib/bundler/templates/newgem/spec/spec_helper.rb.tt

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/setup"
 require "<%= config[:namespaced_path] %>"