fix: transform uses placeholderPattern: false (#163)

We explicitly disable placeholderPatterns to prevent compilation errors
of valid Vue.js templates using Babel 7 transform.
babel/babel#8067

test/fixtures/FooComponent.vue

@@ -1,6 +1,7 @@
 <template>
   <div id="app">
     <div class="lorem-class">some test text</div>
+    <div class="some-class">NOTAPLACEHOLDER</div>
     <button v-on:click="clickHandler('value passed to clickHandler')">Click Me!</button>
   </div>
 </template>

transforms/transformBabel.js

@@ -18,7 +18,7 @@ function appendRenderPlugin(render, staticRenderFns) {
     );
     __vue__options__.render = ${render};
     __vue__options__.staticRenderFns = ${staticRenderFns};
-  `);
+  `, {placeholderPattern: false});
 
   return () => {
     if (!render || !staticRenderFns) {