clj-refactor 3.0

• #483: Improve performance of cljr-slash when typing fraction literals.
• #482: Add missing defgroup form.
• #470: Choose deps.edn over pom.xml as project file.
• Introduce cljr-insert-newline-after-require option.
• Introduce cljr-injected-middleware-version option, allowing users to customize the refactor-nrepl version to be used.
• Dropped support for Emacs 25 (to match upstream changes in CIDER).