Add rbs files to gemspec

webrick.gemspec

@@ -53,6 +53,40 @@ Gem::Specification.new do |s|
     "lib/webrick/ssl.rb",
     "lib/webrick/utils.rb",
     "lib/webrick/version.rb",
+    "sig/accesslog.rbs",
+    "sig/cgi.rbs",
+    "sig/compat.rbs",
+    "sig/config.rbs",
+    "sig/cookie.rbs",
+    "sig/htmlutils.rbs",
+    "sig/httpauth.rbs",
+    "sig/httpauth/authenticator.rbs",
+    "sig/httpauth/basicauth.rbs",
+    "sig/httpauth/digestauth.rbs",
+    "sig/httpauth/htdigest.rbs",
+    "sig/httpauth/htgroup.rbs",
+    "sig/httpauth/htpasswd.rbs",
+    "sig/httpauth/userdb.rbs",
+    "sig/httpproxy.rbs",
+    "sig/httprequest.rbs",
+    "sig/httpresponse.rbs",
+    "sig/https.rbs",
+    "sig/httpserver.rbs",
+    "sig/httpservlet.rbs",
+    "sig/httpservlet/abstract.rbs",
+    "sig/httpservlet/cgi_runner.rbs",
+    "sig/httpservlet/cgihandler.rbs",
+    "sig/httpservlet/erbhandler.rbs",
+    "sig/httpservlet/filehandler.rbs",
+    "sig/httpservlet/prochandler.rbs",
+    "sig/httpstatus.rbs",
+    "sig/httputils.rbs",
+    "sig/httpversion.rbs",
+    "sig/log.rbs",
+    "sig/server.rbs",
+    "sig/ssl.rbs",
+    "sig/utils.rbs",
+    "sig/version.rbs",
     "webrick.gemspec",
   ]
   s.required_ruby_version = ">= 2.4.0"