Refactor: metalsmith-img-sharp (#362)

Author: emmercm

lib/sharp.js

@@ -3,7 +3,7 @@
 import msIf from 'metalsmith-if';
 
 import branch from 'metalsmith-branch';
-import sharp  from 'metalsmith-sharp';
+import sharp  from 'metalsmith-img-sharp';
 
 const png = (compressionLevel = 0, quality = 100) => ({
     namingPattern: '{dir}{name}.png',