Merge pull request #1287 from cylc/prepare-1.6.0

Prepare release: 1.6.0 (again)

Author: oliver-sanders

package.json

@@ -98,6 +98,7 @@
     "wasm-loader": "^1.3.0",
     "webpack": "^4.46.0"
   },
+
   "bugs": {
     "url": "https://github.com/cylc/cylc-ui/issues"
   },