Properties must be hyphenated in html

Author: BennyAlex

README.md

@@ -25,18 +25,18 @@ yarn add vue-picture-input
 <template>
   <div class="hello">    
     <picture-input 
-      ref="pictureInput" 
-      @change="onChange" 
+      ref="pictureInput"
       width="600" 
       height="600" 
       margin="16" 
       accept="image/jpeg,image/png" 
       size="10" 
-      buttonClass="btn"
-      :customStrings="{
+      button-class="btn"
+      :custom-strings="{
         upload: '<h1>Bummer!</h1>',
         drag: 'Drag a 😺 GIF or GTFO'
-      }">
+      }"
+      @change="onChange">
     </picture-input>
   </div>
 </template>