Bump version to 3.1.3 & update Changelog

CHANGELOG

@@ -1,3 +1,7 @@
+== Version 3.1.3
+
+* Expose `complete` action on Fulfillment
+
 == Version 3.1.2
 
 * Includes port in domain URI (when other than http/80 or https/443)

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    shopify_api (3.1.2)
+    shopify_api (3.1.3)
       activeresource (>= 3.0.0)
       thor (>= 0.14.4)
 

lib/shopify_api/version.rb

@@ -1,3 +1,3 @@
 module ShopifyAPI
-  VERSION = "3.1.2"
+  VERSION = "3.1.3"
 end