Initialize ca array

lib/index.js

@@ -3,13 +3,12 @@ var x = require('./enum')
 
 setTimeout(run, 1000)
 
+var ca = https.globalAgent.options
+ca = ca.ca || (ca.ca = [])
+
 x()
 .on('crt', function(crt)
 {
-  var z = https.globalAgent.options
-  var ca = z.ca
-  if(!ca)
-    z.ca = ca = []
   ca.push(x.pki.certificateToPem(crt))
 })