Update summary field and be explicit about which files are packages i…

…n the gem.

omnikassa2.gemspec

@@ -11,15 +11,13 @@ Gem::Specification.new do |spec|
   spec.email         = ['support@kentaa.nl']
   spec.license       = 'MIT'
 
-  spec.summary       = "Omnikassa2 is a gem for Rabobank's Omnikassa 2.0"
-  spec.description   = "Omnikassa2 is a gem for Rabobank's Omnikassa 2.0"
+  spec.summary       = 'Omnikassa2 is a gem for the Rabo Smart Pay API (previously OmniKassa 2.0)'
   spec.homepage      = 'https://github.com/KentaaNL/omnikassa2'
 
   spec.metadata['rubygems_mfa_required'] = 'true'
 
-  spec.files = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{^(test|spec|features)/})
-  end
+  # Specify which files should be added to the gem when it is released.
+  spec.files = Dir['LICENSE', 'README.md', 'lib/**/*']
 
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }