CHANGELOG.md in muffin_man-1.5.6 vs CHANGELOG.md in muffin_man-1.5.7

@@ -1,4 +1,8 @@
+# 1.5.7
+
+- Fix sandbox support for create shipments in Merchant Fulfillment
+
 # 1.5.6
 
 - Sandbox support for create/delete shipments in Merchant Fulfillment [#42](https://github.com/patterninc/muffin_man/pull/42)
 
 # 1.5.5