Re-added a used resource that Lint thought was un-used

library/src/main/res/values/colors.xml

@@ -15,5 +15,6 @@
     <color name="md_divider_white">#10FFFFFF</color>
 
     <color name="md_material_blue_600">#1E88E5</color>
+    <color name="md_material_blue_800">#1565C0</color>
 
 </resources>