Add required prop to Select. (#968)

Upgrade sveld to set paths correctly on Windows.
Make Prettier script compatible with Windows and run it.

docs/src/COMPONENT_API.json

@@ -9419,6 +9419,17 @@
           "isFunctionDeclaration": false,
           "constant": false,
           "reactive": true
+        },
+        {
+          "name": "required",
+          "kind": "let",
+          "description": "Set to `true` to mark the field as required",
+          "type": "boolean",
+          "value": "false",
+          "isFunction": false,
+          "isFunctionDeclaration": false,
+          "constant": false,
+          "reactive": false
         }
       ],
       "slots": [

docs/src/pages/framed/Breakpoint/Breakpoint.svelte

@@ -13,7 +13,7 @@
 
 <h6>on:match</h6>
 <pre>
-  {JSON.stringify(events,null, 2)}
+  {JSON.stringify(events, null, 2)}
 </pre>
 
 <style>