Go back to xss 0.3.8, because 1.0.0 did break snap build.

CHANGELOG.md

@@ -1,11 +1,3 @@
-# Upcoming Wekan release
-
-This release adds the following new features:
-
-* [Update xss to version 1.00](https://github.com/wekan/wekan/commit/5b4d75a976244652d3c86e6d46c23d7c11e9ae8e).
-
-Thanks to GitHub user xet7 for contributions.
-
 # v1.01 2018-05-23 Wekan release
 
 This release possibly fixes the following bugs, please test:

package.json

@@ -29,6 +29,6 @@
     "es6-promise": "^4.2.4",
     "meteor-node-stubs": "^0.4.1",
     "os": "^0.1.1",
-    "xss": "^1.0.0"
+    "xss": "^0.3.8"
   }
 }