Add missing files

Author: lcd1232

.mockery.yaml

@@ -8,3 +8,9 @@ packages:
           dir: .
           mockname: mockDoer
           inpackage: true
+      readCloser:
+        config:
+          filename: mock_read_closer.go
+          dir: .
+          mockname: mockReadCloser
+          inpackage: true

client.go

@@ -12,6 +12,13 @@ type doer interface {
 	Do(req *http.Request) (*http.Response, error)
 }
 
+// readCloser is just an interface to generate mocks.
+//
+//nolint:unused
+type readCloser interface {
+	io.ReadCloser
+}
+
 // Client is a client for the Temp Mail API.
 type Client struct {
 	// doer is an HTTP client.