include node_modules so release .zip is deployable

node_modules/ext/docs/string_/includes.md

@@ -0,0 +1,10 @@
+# `string.includes(position = 0)` _(ext/string\_/includes)_
+
+`includes` method for strings. Resolve native [includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes) if implemented, otherwise fallback to shim implementation.
+
+```javascript
+const includes = require("ext/string_/includes");
+
+includes.call("razdwa", "raz"); // true
+includes.call("razdwa", "trzy"); // false
+```