chore: release v3.1.0

- Updated package.json to version 3.1.0
- Updated README.md version references and features
- Updated Messages/install.txt
- Created Messages/3.1.0.txt
- Updated messages.json with new version reference

Author: actions-user

Messages/3.1.0.txt

@@ -0,0 +1,15 @@
+Nunjucks Toolbox v3.1.0 - Release Notes
+=====================================================
+
+🆕 WHAT'S NEW:
+• Enhanced Nunjucks templating capabilities
+• Fixed various bugs and improved stability
+• Enhanced error handling and validation
+• Performance optimizations and code improvements
+• Better integration with Sublime Text features
+• Improved development workflow and CI/CD processes
+⚠️ BREAKING CHANGES:
+• Significant structural changes - review your setup
+📖 Full documentation: https://github.com/ifthenelse/NunjucksToolbox
+🐛 Report issues: https://github.com/ifthenelse/NunjucksToolbox/issues
+Released on 2025-06-07

Messages/install.txt

@@ -1,4 +1,4 @@
-Nunjucks Toolbox v3.0.0
+Nunjucks Toolbox v3.1.0
 ========================
 
 Thank you for installing Nunjucks Toolbox! 🎉

messages.json

@@ -4,5 +4,6 @@
   "2.0.0": "Messages/2.0.0.txt",
   "2.1.0": "Messages/2.1.0.txt",
   "2.2.0": "Messages/2.2.0.txt",
-  "3.0.0": "Messages/3.0.0.txt"
+  "3.0.0": "Messages/3.0.0.txt",
+  "3.1.0": "Messages/3.1.0.txt"
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "NunjucksToolbox",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Advanced Nunjucks templating syntax package for Sublime Text with enhanced features",
   "keywords": [
     "nunjucks",