RuboCop Performance 1.8.1

Bug fixes

• #164: Fix an error for Performance/CollectionLiteralInLoop when a method from Enumerable is called with no receiver. (@eugeneius)
• #165: Fix a false positive for Performance/Sum when using initial value argument is a variable. (@koic)

Changes

• #163: Change Performance/Detect to also detect offenses when index 0 or -1 is used instead (ie. detect{ ... }[0]). (@dvandersluis)
• #168: Extend Performance/Sum to register an offense for inject(&:+). (@eugeneius)