feat: CLI support

echo '{{ "hello" | capitalize }}' | liquidjs

bin/liquid.js

@@ -0,0 +1,13 @@
+#!/usr/bin/env node
+
+const Liquid = require('..')
+
+let tpl = ''
+process.stdin.on('data', chunk => (tpl += chunk))
+process.stdin.on('end', () => render(tpl))
+
+async function render (tpl) {
+  const liquid = new Liquid()
+  const html = await liquid.parseAndRender(tpl)
+  console.log(html)
+}