Use mod vendor for vendored directory (backwards compatible)

vendor/github.com/gorilla/schema/README.md

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+schema
+======
+[![GoDoc](https://godoc.org/github.com/gorilla/schema?status.svg)](https://godoc.org/github.com/gorilla/schema) [![Build Status](https://travis-ci.org/gorilla/schema.png?branch=master)](https://travis-ci.org/gorilla/schema)
+[![Sourcegraph](https://sourcegraph.com/github.com/gorilla/schema/-/badge.svg)](https://sourcegraph.com/github.com/gorilla/schema?badge)
+
+
+Package gorilla/schema converts structs to and from form values.
+
+## Example
+
+Here's a quick example: we parse POST form values and then decode them into a struct:
+
+```go
+// Set a Decoder instance as a package global, because it caches 
+// meta-data about structs, and an instance can be shared safely.
+var decoder = schema.NewDecoder()
+
+type Person struct {
+    Name  string
+    Phone string
+}
+
+func MyHandler(w http.ResponseWriter, r *http.Request) {
+    err := r.ParseForm()
+    if err != nil {
+        // Handle error
+    }
+
+    var person Person
+    
+    // r.PostForm is a map of our POST form values
+    err := decoder.Decode(&person, r.PostForm)
+    if err != nil {
+        // Handle error
+    }
+
+    // Do something with person.Name or person.Phone
+}
+```
+
+Conversely, contents of a struct can be encoded into form values. Here's a variant of the previous example using the Encoder:
+
+```go
+var encoder = schema.NewEncoder()
+
+func MyHttpRequest() {
+    person := Person{"Jane Doe", "555-5555"}
+    form := url.Values{}
+
+    err := encoder.Encode(person, form)
+
+    if err != nil {
+        // Handle error
+    }
+
+    // Use form values, for example, with an http client
+    client := new(http.Client)
+    res, err := client.PostForm("http://my-api.test", form)
+}
+
+```
+
+To define custom names for fields, use a struct tag "schema". To not populate certain fields, use a dash for the name and it will be ignored:
+
+```go
+type Person struct {
+    Name  string `schema:"name"`  // custom name
+    Phone string `schema:"phone"` // custom name
+    Admin bool   `schema:"-"`     // this field is never set
+}
+```
+
+The supported field types in the struct are:
+
+* bool
+* float variants (float32, float64)
+* int variants (int, int8, int16, int32, int64)
+* string
+* uint variants (uint, uint8, uint16, uint32, uint64)
+* struct
+* a pointer to one of the above types
+* a slice or a pointer to a slice of one of the above types
+
+Unsupported types are simply ignored, however custom types can be registered to be converted.
+
+More examples are available on the Gorilla website: http://www.gorillatoolkit.org/pkg/schema
+
+## License 
+
+BSD licensed. See the LICENSE file for details.