Added testing using ruby 3.5

Author: njh

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
+        ruby: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '3.5']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3

mqtt.gemspec

@@ -20,6 +20,8 @@ Gem::Specification.new do |gem|
   gem.executables   = %w()
   gem.require_paths = %w(lib)
 
+  gem.add_runtime_dependency 'logger'
+
   if Gem.ruby_version > Gem::Version.new('3.0')
     gem.add_development_dependency 'bundler',  '>= 1.11.2'
     gem.add_development_dependency 'rake',     '>= 10.2.2'