Clarify .editorconfig should be lower-cased

See

- editorconfig/specification#70
- editorconfig/editorconfig#523

Author: xuhdev

index.html

@@ -19,7 +19,7 @@ <h2>What's an EditorConfig file look like?</h2>
 
   <section id="example-file">
     <h3>Example file</h3>
-    <p>Below is an example <code>.editorconfig</code> file setting end-of-line and indentation styles for Python and JavaScript files.</p>
+    <p>Below is an example <code>.editorconfig</code> (filename all lowercase) file setting end-of-line and indentation styles for Python and JavaScript files.</p>
     <div class="code-container">
 {% highlight ini %}
 # EditorConfig is awesome: https://editorconfig.org