add stroke

src/main/res/drawable/ic_comment.xml

@@ -4,6 +4,9 @@
         android:width="24dp"
         xmlns:android="http://schemas.android.com/apk/res/android">
     <path
+        android:strokeColor="#FFFFFFFF"
+        android:strokeWidth="0.2"
+        android:strokeMiterLimit="4"
         android:fillColor="#ff757575"
         android:pathData="M8,1.5C3.582,1.5 0,3.962 0,7s3.582,5.5 8,5.5c0.25,0 0.49,-0.016 0.734,-0.03L13,16v-4.703c1.83,-1.008 3,-2.56 3,-4.297 0,-3.038 -3.582,-5.5 -8,-5.5z"/>
 </vector>