Bump u-case to 5.0.0 and refine compatibility table

- Bump VERSION from 4.5.2 -> 5.0.0 to signal the Ruby/Rails floor change
  (Ruby >= 2.7, activemodel >= 6.0)
- Compatibility table: label the "main" row 5.0.0 instead of "unreleased"
- v4.x row: keep label as 4.5.1 and widen activemodel column to
  ">= 3.2, <= 8.1" (the actual support range for the v4.x line)
- Installation example: gem 'u-case', '~> 5.0'

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: serradura

README.md

@@ -101,8 +101,8 @@ unreleased| https://github.com/serradura/u-case/blob/main/README.md
 
 | u-case         | branch  | ruby     | activemodel   | u-attributes  |
 | -------------- | ------- | -------- | ------------- | ------------- |
-| unreleased     | main    | >= 2.7   | >= 6.0        | >= 2.7, < 3.0 |
-| 4.5.2          | v4.x    | >= 2.2.0 | >= 3.2, < 7.0 | >= 2.7, < 3.0 |
+| 5.0.0          | main    | >= 2.7   | >= 6.0        | >= 2.7, < 3.0 |
+| 4.5.1          | v4.x    | >= 2.2.0 | >= 3.2, <= 8.1 | >= 2.7, < 3.0 |
 | 3.1.0          | v3.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
 | 2.6.0          | v2.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
 | 1.1.0          | v1.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
@@ -126,7 +126,7 @@ unreleased| https://github.com/serradura/u-case/blob/main/README.md
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'u-case', '~> 4.5.1'
+gem 'u-case', '~> 5.0'
 ```
 
 And then execute:

README.pt-BR.md

@@ -99,8 +99,8 @@ unreleased| https://github.com/serradura/u-case/blob/main/README.md
 
 | u-case         | branch  | ruby     | activemodel   | u-attributes  |
 | -------------- | ------- | -------- | ------------- | ------------- |
-| unreleased     | main    | >= 2.7   | >= 6.0        | >= 2.7, < 3.0 |
-| 4.5.2          | v4.x    | >= 2.2.0 | >= 3.2, < 7.0 | >= 2.7, < 3.0 |
+| 5.0.0          | main    | >= 2.7   | >= 6.0        | >= 2.7, < 3.0 |
+| 4.5.1          | v4.x    | >= 2.2.0 | >= 3.2, <= 8.1 | >= 2.7, < 3.0 |
 | 3.1.0          | v3.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
 | 2.6.0          | v2.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
 | 1.1.0          | v1.x    | >= 2.2.0 | >= 3.2, < 6.1 |        ~> 1.1 |
@@ -124,7 +124,7 @@ unreleased| https://github.com/serradura/u-case/blob/main/README.md
 Adicione essa linha ao Gemfile da sua aplicação:
 
 ```ruby
-gem 'u-case', '~> 4.5.1'
+gem 'u-case', '~> 5.0'
 ```
 
 E então execute:

lib/micro/case/version.rb

@@ -2,6 +2,6 @@
 
 module Micro
   class Case
-    VERSION = '4.5.2'.freeze
+    VERSION = '5.0.0'.freeze
   end
 end