Update helmet-csp to 2.4.0

Author: EvanHahn

HISTORY.md

@@ -1,3 +1,8 @@
+3.5.0 / 2017-03-06
+==================
+
+- new: `csp` now supports the `worker-src` directive
+
 3.4.1 / 2017-02-24
 ==================
 

package.json

@@ -31,7 +31,7 @@
     "dns-prefetch-control": "0.1.0",
     "dont-sniff-mimetype": "1.0.0",
     "frameguard": "3.0.0",
-    "helmet-csp": "2.3.0",
+    "helmet-csp": "2.4.0",
     "hide-powered-by": "1.0.0",
     "hpkp": "2.0.0",
     "hsts": "2.0.0",