imap-backup.gemspec in imap-backup-4.0.0.rc5 vs imap-backup.gemspec in imap-backup-4.0.0.rc6

@@ -1,16 +1,26 @@
 $LOAD_PATH.unshift(File.expand_path("lib", __dir__))
 require "imap/backup/version"
+require "rake/file_list"
 
 Gem::Specification.new do |gem|
   gem.name          = "imap-backup"
   gem.description   = "Backup GMail, or any other IMAP email service, to disk."
   gem.summary       = "Backup GMail (or other IMAP) accounts to disk"
   gem.authors       = ["Joe Yates"]
   gem.email         = ["[e-mail]"]
   gem.homepage      = "https://github.com/joeyates/imap-backup"
+  gem.licenses      = ["MIT"]
 
-  gem.files         = `git ls-files`.split($OUTPUT_RECORD_SEPARATOR)
+  # Build list of files manually, see also
+  # https://github.com/rubygems/rubygems/blob/master/bundler/bundler.gemspec#L37
+  gem.files         = %w[bin/imap-backup]
+  gem.files         += Dir.glob("docs/*{.png,.md}")
+  gem.files         += Dir.glob("lib/**/*.rb")
+  gem.files         += Dir.glob("spec/**/*{.rb,.yml}")
+  gem.files         += %w[imap-backup.gemspec]
+  gem.files         += %w[LICENSE README.md]
+
   gem.executables   = gem.files.grep(%r{^bin/}).map { |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^spec/})
   gem.require_paths = ["lib"]
   gem.required_ruby_version = ">= 2.5"
   gem.version = Imap::Backup::VERSION