chore: Bump version to 1.2.1 for Android compatibility

- Update version in all README files from 1.0.0 to 1.2.1
- Update SimpleLogger dependency to 0.8.0 (Android compatible)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fatbobman

Package.swift

@@ -20,7 +20,7 @@ let package = Package(
             targets: ["Objects2XLSX"])
     ],
     dependencies: [
-        .package(url: "https://github.com/fatbobman/SimpleLogger.git", from: "0.7.0")
+        .package(url: "https://github.com/fatbobman/SimpleLogger.git", from: "0.8.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.

README.md

@@ -73,7 +73,7 @@ Add Objects2XLSX to your project using Xcode's Package Manager or by adding it t
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.0.0")
+    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.2.1")
 ]
 ```
 

README_CN.md

@@ -73,7 +73,7 @@
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.0.0")
+    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.2.1")
 ]
 ```
 

README_JP.md

@@ -73,7 +73,7 @@ Xcode の Package Manager を使用するか、`Package.swift` に Objects2XLSX
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.0.0")
+    .package(url: "https://github.com/fatbobman/Objects2XLSX.git", from: "1.2.1")
 ]
 ```