Fixed the rubocop warnings

spec/bundler/runtime/inline_spec.rb

@@ -90,7 +90,7 @@ RSpec.describe "bundler/inline#gemfile" do
     expect(out).to include("Installing activesupport")
     err.gsub! %r{(.*lib/sinatra/base\.rb:\d+: warning: constant ::Fixnum is deprecated$)}, ""
     err_lines = err.split("\n")
-    err_lines.reject!{|line| line =~ /\.rb:\d+: warning: /}
+    err_lines.reject!{|line| line =~ /\.rb:\d+: warning: / }
     expect(err_lines).to be_empty
     expect(exitstatus).to be_zero if exitstatus
   end