Update dependency highland to v2.13.4

Author: renovate-bot

package.json

@@ -13,7 +13,7 @@
     "clean-css": "4.2.1",
     "express": "4.16.4",
     "express-history-api-fallback": "2.2.1",
-    "highland": "2.13.3",
+    "highland": "2.13.4",
     "html-minifier": "3.5.21",
     "minimalcss": "0.8.2",
     "mkdirp": "0.5.1",

yarn.lock

@@ -1464,9 +1464,9 @@ [email protected]:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
 
-[email protected].3:
-  version "2.13.3"
-  resolved "https://registry.yarnpkg.com/highland/-/highland-2.13.3.tgz#d3c841d9fa2416f6210ab0255ee1d0feae06d2af"
+[email protected].4:
+  version "2.13.4"
+  resolved "https://registry.yarnpkg.com/highland/-/highland-2.13.4.tgz#c8befa3f4012c9033728bc2250f5d3ba8f64b634"
   dependencies:
     util-deprecate "^1.0.2"