Force update github image cache

index.html

@@ -14,7 +14,7 @@ <h1 class="title">Comics Reader</h1>
 				<button class="btn btn-success download-button">前往下載</button>
 			</a>
 		</div>
-		<img src="./images/reader.png" alt="reader-view">
+		<img src="./images/reader.png?" alt="reader-view">
 	</div>
 </section>
 
@@ -33,7 +33,7 @@ <h2>特色</h2>
 				</ul>
 			</div>
 			<div class="col-s-12 col-lg-8 feature-image">
-				<img src="./images/collection.png" alt="collection">
+				<img src="./images/collection.png?" alt="collection">
 			</div>
 		</div>
 		<div class="row">