Adjust size of the read by string

app/src/main/res/layout/fragment_message_info.xml

@@ -28,6 +28,7 @@
         android:layout_marginEnd="8dp"
         android:layout_marginStart="8dp"
         android:layout_marginTop="8dp"
+        android:textSize="18sp"
         android:text="@string/read_by"
         app:layout_constraintBottom_toTopOf="@+id/receipt_list"
         app:layout_constraintEnd_toEndOf="parent"
@@ -43,4 +44,4 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/text_read_by" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</android.support.constraint.ConstraintLayout>