Relax gem requirement to allow Rails 7

Author: Jolyon Pawlyn

.travis.yml

@@ -32,6 +32,8 @@ _rails_supported_versions:
   - &rails_5_2_jruby RAILS_VERSION=5.2 JRUBY_OPTS='--dev -J-Xmx1024M --debug'
   - &rails_6_0 RAILS_VERSION=6.0
   - &rails_6_0_jruby RAILS_VERSION=6.0 JRUBY_OPTS='--dev -J-Xmx1024M --debug'
+  - &rails_7_0 RAILS_VERSION=7.0
+  - &rails_7_0_jruby RAILS_VERSION=7.0 JRUBY_OPTS='--dev -J-Xmx1024M --debug'
   - &rails_master RAILS_VERSION=master
   - &rails_master_jruby RAILS_VERSION=master JRUBY_OPTS='--dev -J-Xmx1024M --debug'
 
@@ -59,6 +61,7 @@ env:
     - *rails_5_1
     - *rails_5_2
     - *rails_6_0
+    - *rails_7_0
     - *rails_master
 
 rvm:
@@ -87,13 +90,15 @@ jobs:
     - { rvm: *jruby_9_2,  jdk: *jdk_8, env: *rails_5_1_jruby }
     - { rvm: *jruby_9_2,  jdk: *jdk_8, env: *rails_5_2_jruby }
     - { rvm: *jruby_9_2,  jdk: *jdk_8, env: *rails_6_0_jruby }
+    - { rvm: *jruby_9_2,  jdk: *jdk_8, env: *rails_7_0_jruby }
     - { rvm: *jruby_9_2,  jdk: *jdk_8, env: *rails_master_jruby }
 
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_4_2_jruby }
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_5_0_jruby }
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_5_1_jruby }
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_5_2_jruby }
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_6_0_jruby }
+    - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_7_0_jruby }
     - { rvm: *jruby_head, jdk: *jdk_8, env: *rails_master_jruby }
 
   exclude:
@@ -107,6 +112,13 @@ jobs:
     - { rvm: *ruby_2_2,  env: *rails_6_0 }
     - { rvm: *ruby_2_3,  env: *rails_6_0 }
 
+    - { rvm: *ruby_2_1,  env: *rails_7_0 }
+    - { rvm: *ruby_2_2,  env: *rails_7_0 }
+    - { rvm: *ruby_2_3,  env: *rails_7_0 }
+    - { rvm: *ruby_2_4,  env: *rails_7_0 }
+    - { rvm: *ruby_2_5,  env: *rails_7_0 }
+    - { rvm: *ruby_2_6,  env: *rails_7_0 }
+
     - { rvm: *ruby_2_1,  env: *rails_master }
     - { rvm: *ruby_2_2,  env: *rails_master }
     - { rvm: *ruby_2_3,  env: *rails_master }

active_model_serializers.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.1'
 
-  rails_versions = ['>= 4.1', '< 7.0']
+  rails_versions = ['>= 4.1', '< 8.0']
   spec.add_runtime_dependency 'activemodel', rails_versions
   # 'activesupport', rails_versions
   # 'builder'