Remove support for old Alchemy versions

Drop support for Alchemy 4.x

Author: tvdeyen

.travis.yml

@@ -6,12 +6,9 @@ cache:
 rvm:
   - 2.5.8
   - 2.6.6
-  - 2.7.1
+  - 2.7.2
 env:
   matrix:
-    - ALCHEMY_BRANCH=4.4-stable
-    - ALCHEMY_BRANCH=4.5-stable
-    - ALCHEMY_BRANCH=4.6-stable
     - ALCHEMY_BRANCH=5.0-stable
     - ALCHEMY_BRANCH=main
 matrix:

alchemy-devise.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
 
   s.files = Dir["{app,config,db,lib}/**/*", "LICENSE", "Rakefile", "README.md"]
 
-  s.add_dependency "alchemy_cms", [">= 4.1.0", "< 6"]
+  s.add_dependency "alchemy_cms", [">= 5.0.0", "< 6"]
   s.add_dependency "devise",      [">= 4.7.1", "< 5"]
 
   s.add_development_dependency "capybara"