fix(package): update cross-env to version 7.0.0

Closes #93

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "@types/sqlite3": "^3.1.3",
     "bottleneck": "2.13.1",
     "compression": "1.7.3",
-    "cross-env": "5.2.0",
+    "cross-env": "7.0.0",
     "dateformat": "3.0.3",
     "debug": "4.1.0",
     "download": "7.1.0",