Update ring dependency to 0.13
@@ -13,7 +13,7 @@ keywords = ["sdk", "azure", "rest", "iot", "cloud"]
categories = ["api-bindings"]
[dependencies]
-ring = "0.12.1"
+ring = "0.13"
md5 = "0.3.7"
RustyXML = "0.1.1"
base64 = "0.9.2"
