Add missing Client method

Author: yaronf

client.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
+	"strings"
 )
 
 // Client represents an HTTP client that optionally signs requests and optionally verifies responses.
@@ -108,3 +110,8 @@ func (c *Client) Post(url, contentType string, body io.Reader) (res *http.Respon
 	req.Header.Set("Content-Type", contentType)
 	return c.Do(req)
 }
+
+// PostForm sends an HTTP POST, with data keys and values URL-encoded as the request body.
+func (c *Client) PostForm(url string, data url.Values) (resp *http.Response, err error) {
+	return c.Post(url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
+}

client_test.go

@@ -188,11 +188,12 @@ func TestClient_Head(t *testing.T) {
 		wantErr bool
 	}{
 		{
-			name: "TLS",
+			name: "Happy Path",
 			fields: fields{
 				sigName: "sig1",
 				signer: func() *Signer {
-					signer, _ := NewHMACSHA256Signer("key1", bytes.Repeat([]byte{1}, 64), NewSignConfig(), Headers("@method"))
+					signer, _ := NewHMACSHA256Signer("key1", bytes.Repeat([]byte{1}, 64), NewSignConfig(),
+						Headers("@method"))
 					return signer
 				}(),
 				verifier:      nil,