Update cross-env to the latest version 🚀 (#315)

* fix(package): update cross-env to version 5.1.6

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

package-lock.json

@@ -2456,12 +2456,12 @@
       }
     },
     "cross-env": {
-      "version": "5.1.5",
-      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.1.5.tgz",
-      "integrity": "sha512-GSiNTbvTU3pXzewRKGP0Y+rVP2CzifY2pqSEdtHzLLj41pRdkrgY7e4uSnBoR/pmYaqZr/lwwjg/Q4kNX30hWQ==",
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.1.6.tgz",
+      "integrity": "sha512-VWTDq+G4v383SzgRS7jsAVWqEWF0aKZpDz1GVjhONvPRgHB1LnxP2sXUVFKbykHkPSnfRKS8YdiDevWFwZmQ9g==",
       "requires": {
-        "cross-spawn": "5.1.0",
-        "is-windows": "1.0.2"
+        "cross-spawn": "^5.1.0",
+        "is-windows": "^1.0.0"
       }
     },
     "cross-spawn": {

package.json

@@ -45,7 +45,7 @@
     "cheerio": "1.0.0-rc.2",
     "child-process-promise": "2.2.1",
     "chokidar": "2.0.3",
-    "cross-env": "5.1.5",
+    "cross-env": "5.1.6",
     "css-loader": "0.28.11",
     "escape-html": "1.0.3",
     "esm": "3.0.34",