v2.9.1

• Fix Ruby 2.7 deprecation warnings, see #85, #87 — @donv, @felixbuenemann

v2.9.0

• Allow Arel nodes in the :order option, see #78, #79 — @felixbuenemann, @vladvinnikov
• Added support for Rails 6.0, see #81 — @felixbuenemann

v2.8.0

• Added support for Rails 5.2, see #76, #77 — @felixbuenemann

v2.7.1

• Fix column quoting if the :order option is a symbol, see #73, #74 — @felixbuenemann

v2.7.0

• Added support for Rails 5.1, see #67, #68 — @felixbuenemann, @marcinwierzbicki

v2.6.1

• Avoid conflicts of #level method with existing column, see #57, #58, #60 — @markhgbrewster
• Fix tests on Rails 4.2 with Ruby < 2.1 — @felixbuenemann

v2.6.0

• Add generations methods, see #56 — @markhgbrewster

v2.5.1

• Fix early database connection in acts_as_tree, see #55 — @felixbuenemann

v2.5.0

• Allow for use of a different primary key, see #50 — @Two9A

v2.4.0

• Added support for Rails 5.0, see #46 — @klacointe