telegram-bot.gemspec in telegram-bot-0.13.1 vs telegram-bot.gemspec in telegram-bot-0.14.0

@@ -15,9 +15,12 @@
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^spec/}) }
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
+  spec.post_install_message = 'Breaking changes in v0.14! ' \
+    'See upgrade guide at https://github.com/telegram-bot-rb/telegram-bot/wiki/Upgrading-to-0.14'
+
   spec.required_ruby_version = '~> 2.0'
 
   spec.add_dependency 'actionpack', '>= 4.0', '< 6.0'
   spec.add_dependency 'activesupport', '>= 4.0', '< 6.0'
   spec.add_dependency 'httpclient', '~> 2.7'