include node_modules so release .zip is deployable

node_modules/ext/docs/string_/capitalize.md

@@ -0,0 +1,9 @@
+# `string.capitalize()` _(ext/string\_/capitalize)_
+
+Capitalize input string, e.g. convert `this is a test` into `This is a test`.
+
+```javascript
+const capitalize = require("ext/string_/capitalize");
+
+capitalize.call("this is a test"); // This is a test
+```