Use a Dir glob to prevent LoadError

Related to #268

Author: brunoocasali

meilisearch.gemspec

@@ -13,15 +13,7 @@ Gem::Specification.new do |s|
   s.licenses    = ['MIT']
   s.date        = Time.now
 
-  s.files       = [
-    'lib/meilisearch.rb',
-    'lib/meilisearch/error.rb',
-    'lib/meilisearch/http_request.rb',
-    'lib/meilisearch/client.rb',
-    'lib/meilisearch/index.rb',
-    'lib/meilisearch/version.rb',
-    'lib/meilisearch/utils.rb'
-  ]
+  s.files       = Dir['{lib}/**/*', 'LICENSE', 'README.md']
 
   s.required_ruby_version = '>= 2.6.0'
   s.add_dependency 'httparty', '>= 0.17.1', '< 0.21.0'