TUN-528: Move cloudflared into a separate repo

vendor/github.com/equinox-io/equinox/README.md

@@ -0,0 +1,99 @@
+# equinox client SDK [![godoc reference](https://godoc.org/github.com/equinox-io/equinox?status.png)](https://godoc.org/github.com/equinox-io/equinox)
+
+Package equinox allows applications to remotely update themselves with the [equinox.io](https://equinox.io) service.
+
+## Minimal Working Example
+
+```go
+import "github.com/equinox-io/equinox"
+
+const appID = "<YOUR EQUINOX APP ID>"
+
+var publicKey = []byte(`
+-----BEGIN PUBLIC KEY-----
+MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEtrVmBxQvheRArXjg2vG1xIprWGuCyESx
+MMY8pjmjepSy2kuz+nl9aFLqmr+rDNdYvEBqQaZrYMc6k29gjvoQnQ==
+-----END PUBLIC KEY-----
+`)
+
+func update(channel string) error {
+    opts := equinox.Options{Channel: channel}
+    if err := opts.SetPublicKeyPEM(publicKey); err != nil {
+        return err
+    }
+
+    // check for the update
+    resp, err := equinox.Check(appID, opts)
+    switch {
+    case err == equinox.NotAvailableErr:
+        fmt.Println("No update available, already at the latest version!")
+        return nil
+    case err != nil:
+        return err
+    }
+
+    // fetch the update and apply it
+    err = resp.Apply()
+    if err != nil {
+        return err
+    }
+
+    fmt.Printf("Updated to new version: %s!\n", resp.ReleaseVersion)
+    return nil
+}
+```
+
+
+## Update To Specific Version
+
+When you specify a channel in the update options, equinox will try to update the application
+to the latest release of your application published to that channel. Instead, you may wish to
+update the application to a specific (possibly older) version. You can do this by explicitly setting
+Version in the Options struct:
+
+```go
+opts := equinox.Options{Version: "0.1.2"}
+```
+
+## Prompt For Update
+
+You may wish to ask the user for approval before updating to a new version. This is as simple
+as calling the Check function and only calling Apply on the returned result if the user approves.
+Example:
+
+```go
+// check for the update
+resp, err := equinox.Check(appID, opts)
+switch {
+case err == equinox.NotAvailableErr:
+    fmt.Println("No update available, already at the latest version!")
+    return nil
+case err != nil:
+    return err
+}
+
+fmt.Println("New version available!")
+fmt.Println("Version:", resp.ReleaseVersion)
+fmt.Println("Name:", resp.ReleaseTitle)
+fmt.Println("Details:", resp.ReleaseDescription)
+
+ok := prompt("Would you like to update?")
+
+if !ok {
+    return
+}
+
+err = resp.Apply()
+// ...
+```
+
+## Generating Keys
+
+All equinox releases must be signed with a private ECDSA key, and all updates verified with the
+public key portion. To do that, you'll need to generate a key pair. The equinox release tool can
+generate an ecdsa key pair for you easily:
+
+```shell
+equinox genkey
+```
+