update widget test prefix

Author: Nash0x7E2

README.md

@@ -45,7 +45,7 @@ Awesome Flutter Snippets is a collection of commonly used Flutter classes and me
 | `tweenAnimationBuilder`    | Tween Animation Builder | Widget builder that animates a property of a Widget to a target value whenever the target value changes.
 | `valueListenableBuilder`    | Value Listenable Builder | Given a ValueListenable<T> and a builder which builds widgets from concrete values of T, this class will automatically register itself as a listener of the ValueListenable and call the builder with updated values when the value changes.
 | `f-test`    | Test | Create a test function.
-| `f-testWidgets`    | Test Widgets | Create a testWidgets function.
+| `widgetTest`    | Test Widgets | Create a testWidgets function.
 
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snippets/snippets.json

@@ -445,7 +445,7 @@
         "description": "Create a test function"
     },
     "Test Widgets": {
-        "prefix": "f-testWidgets",
+        "prefix": "widgetTest",
         "body": [
             "testWidgets(",
             "   \"${1:test description}\",",