fix(package): update escape-string-regexp to version 4.0.0

Closes #30

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "debug": "4.1.1",
     "del": "5.1.0",
     "diff": "4.0.2",
-    "escape-string-regexp": "2.0.0",
+    "escape-string-regexp": "4.0.0",
     "globby": "10.0.1",
     "mkdirp": "^0.5.1",
     "pretty-ms": "5.1.0",