Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-request/tests/test-agentOptions.js

@@ -0,0 +1,23 @@
+var request = require('../index')
+  , http = require('http')
+  , server = require('./server')
+  , assert = require('assert')
+  ;
+
+var s = http.createServer(function (req, resp) {
+  resp.statusCode = 200
+  resp.end('')
+}).listen(6767, function () {
+  // requests without agentOptions should use global agent
+  var r = request('http://localhost:6767', function (e, resp, body) {
+    assert.deepEqual(r.agent, http.globalAgent);
+    assert.equal(Object.keys(r.pool).length, 0);
+
+    // requests with agentOptions should apply agentOptions to new agent in pool
+    var r2 = request('http://localhost:6767', { agentOptions: { foo: 'bar' } }, function (e, resp, body) {
+      assert.deepEqual(r2.agent.options, { foo: 'bar' });
+      assert.equal(Object.keys(r2.pool).length, 1);
+	    s.close()
+ 	 });
+  })
+})