docs(button): typo fix

Pooya Parsa · Pooya Parsa · commit 4f254fd382a1 · 2017-12-15T20:44:08.000+03:30
diff --git a/src/components/button/README.md b/src/components/button/README.md
@@ -6,7 +6,7 @@ Includes support for a handful of contextual variations, sizes, states, and more
 ```html
 <div class="row">
     <template v-for="variant in ['primary','secondary','success','outline-success','warning','danger','link']">
-        <div class="col-md-4 pb-2" v-for="size in ['sm','','lg']" :key="`{variant}_${size}`">
+        <div class="col-md-4 pb-2" v-for="size in ['sm','','lg']" :key="`${variant}_${size}`">
             <b-button :size="size" :variant="variant">
                 {{variant}} {{size}}
             </b-button>
