build(deps-dev): bump @zeit/ncc from 0.13.0 to 0.13.1 (#38)

Bumps [@zeit/ncc](https://github.com/zeit/ncc) from 0.13.0 to 0.13.1.
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package-lock.json

@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@zeit/ncc": {
-      "version": "0.13.0",
-      "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.13.0.tgz",
-      "integrity": "sha512-I2pLWVzdq2f4U6jxeu2EV7Q7dMsnXkgf+Jq9vhgYWzPzfMcCLhomPatBuvR3VpNZilqIXePZThlPuGrmA3ReFw==",
+      "version": "0.13.1",
+      "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.13.1.tgz",
+      "integrity": "sha512-PchcZw+UM0RCFi1EZZtnoJ5wkH7+DHidmnXSHDW3db0g/wqZR40dWAOfuesyMqyjG+h/AYuKvBIdnOqqDZhZpQ==",
       "dev": true
     },
     "acorn": {
@@ -153,7 +153,7 @@
       "dependencies": {
         "chalk": {
           "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
@@ -1595,6 +1595,7 @@
           "version": "0.1.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^3.0.2",
             "longest": "^1.0.1",
@@ -2777,7 +2778,8 @@
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "loose-envify": {
           "version": "1.3.1",