loosen activeadmin restriction to allow 2.0

Author: iarie

.travis.yml

@@ -13,6 +13,7 @@ env:
     - RAILS=5.1.0 AA=1.2.1
     - RAILS=5.2.1 AA=1.3.1
     - RAILS=5.2.1 AA=1.4.0
+    - RAILS=5.2.1 AA=2.0
 rvm:
   - 2.3
   - 2.5

active_admin_datetimepicker.gemspec

@@ -19,6 +19,6 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "activeadmin", "~> 1.1"
+  spec.add_dependency "activeadmin", ">= 1.1", "< 3.a"
   spec.add_dependency "xdan-datetimepicker-rails", "~> 2.5.4"
 end