CHANGELOG.md in muffin_man-1.5.8 vs CHANGELOG.md in muffin_man-1.5.9

@@ -1,4 +1,12 @@
+# 1.5.9
+
+- Support for estimateTransport, getTransportDetails, confirmTransport, and voidTransport [#44](https://github.com/patterninc/muffin_man/pull/44)
+
+# 1.5.8
+
+- Add batch functionality to competitive price
+
 # 1.5.7
 
 - Fix sandbox support for create shipments in Merchant Fulfillment
 
 # 1.5.6