Improve usage example in README.md (#778)

By showing explicitly how/where `Mustache` comes from in that specific scenario, where CommonJS is assume to be available, either provided by Node.js or a build tool like webpack etc. For the record, it could also be `import` if the using project uses ES Modules, as we've recently exposed native ES Modules support as well.
janl · Apr 11, 2021 · edc988b · edc988b
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commit edc988b
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diff --git a/README.md b/README.md
@@ -37,6 +37,8 @@ $ npm install mustache --save
 Below is a quick example how to use mustache.js:
 
 ```js
+var Mustache = require('mustache');
+
 var view = {
   title: "Joe",
   calc: function () {