Removed old rails versions

Author: MikolajSiwek

.github/workflows/ci.yml

@@ -8,21 +8,11 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - 2.4
-          - 2.5
-          - 2.6
+          - 2.7
         gemfile:
-          - rails4.2
-          - rails5.0
-          - rails5.1
           - rails5.2
           - rails6.0
           - rails6.1
-        exclude:
-          - ruby-version: 2.4
-            gemfile: rails6.0
-          - ruby-version: 2.4
-            gemfile: rails6.1
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
     steps:

gemfiles/rails4.2.gemfile

@@ -1,8 +1,8 @@
 PATH
   remote: ..
   specs:
-    migration_tools (1.7.0)
-      activerecord (>= 4.2.0, < 6.2)
+    migration_tools (1.7.1)
+      activerecord (>= 5.2.0, < 6.2)
 
 GEM
   remote: https://rubygems.org/
@@ -34,6 +34,7 @@ GEM
       thread_safe (~> 0.1)
 
 PLATFORMS
+  ruby
   x86_64-darwin-19
   x86_64-darwin-20
   x86_64-linux

gemfiles/rails4.2.gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     migration_tools (1.7.1)
-      activerecord (>= 4.2.0, < 6.2)
+      activerecord (>= 5.2.0, < 6.2)
 
 GEM
   remote: https://rubygems.org/

gemfiles/rails5.0.gemfile

@@ -1,8 +1,8 @@
 PATH
   remote: ..
   specs:
-    migration_tools (1.7.0)
-      activerecord (>= 4.2.0, < 6.2)
+    migration_tools (1.7.1)
+      activerecord (>= 5.2.0, < 6.2)
 
 GEM
   remote: https://rubygems.org/
@@ -33,6 +33,7 @@ GEM
     zeitwerk (2.4.2)
 
 PLATFORMS
+  ruby
   x86_64-darwin-19
   x86_64-darwin-20
   x86_64-linux