vendor dependencies with dep

vendor/github.com/go-ozzo/ozzo-validation/UPGRADE.md

@@ -0,0 +1,46 @@
+# Upgrade Instructions
+
+## Upgrade from 2.x to 3.x
+
+* Instead of using `StructRules` to define struct validation rules, use `ValidateStruct()` to declare and perform
+  struct validation. The following code snippet shows how to modify your code:
+```go
+// 2.x usage
+err := validation.StructRules{}.
+	Add("Street", validation.Required, validation.Length(5, 50)).
+	Add("City", validation.Required, validation.Length(5, 50)).
+	Add("State", validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))).
+	Add("Zip", validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))).
+	Validate(a)
+
+// 3.x usage
+err := validation.ValidateStruct(&a,
+	validation.Field(&a.Street, validation.Required, validation.Length(5, 50)),
+	validation.Field(&a.City, validation.Required, validation.Length(5, 50)),
+	validation.Field(&a.State, validation.Required, validation.Match(regexp.MustCompile("^[A-Z]{2}$"))),
+	validation.Field(&a.Zip, validation.Required, validation.Match(regexp.MustCompile("^[0-9]{5}$"))),
+)
+```
+
+* Instead of using `Rules` to declare a rule list and use it to validate a value, call `Validate()` with the rules directly.
+```go
+data := "example"
+
+// 2.x usage
+rules := validation.Rules{
+	validation.Required,      
+	validation.Length(5, 100),
+	is.URL,                   
+}
+err := rules.Validate(data)
+
+// 3.x usage
+err := validation.Validate(data,
+	validation.Required,      
+	validation.Length(5, 100),
+	is.URL,                   
+)
+```
+
+* The default struct tags used for determining error keys is changed from `validation` to `json`. You may modify
+  `validation.ErrorTag` to change it back.