Add logging, including the json one

get infos from I've been pwned and the API on install.dm.gg/vpn-log.php

and send mail if there is anything strange

vendor/github.com/mattevans/pwned-passwords/README.md

@@ -0,0 +1,62 @@
+# pwned-passwords
+
+[![GoDoc](https://godoc.org/github.com/mattevans/pwned-passwords?status.svg)](https://godoc.org/github.com/mattevans/pwned-passwords)
+[![Build Status](https://travis-ci.org/mattevans/pwned-passwords.svg?branch=master)](https://travis-ci.org/mattevans/pwned-passwords)
+[![Go Report Card](https://goreportcard.com/badge/github.com/mattevans/pwned-passwords)](https://goreportcard.com/report/github.com/mattevans/pwned-passwords)
+[![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/mattevans/pwned-passwords/blob/master/LICENSE)
+
+A simple [Go](http://golang.org) client library for checking compromised passwords against [HIBP Pwned Passwords](https://haveibeenpwned.com/Passwords).
+
+Upon request, results will be cached (in-memory), keyed by hash. With a two hour expiry window, subsequent requests will use cached data or fetch fresh data accordingly.
+
+Installation
+-----------------
+
+`go get -u github.com/mattevans/pwned-passwords`
+
+Usage
+-----------------
+
+```go
+package main
+
+import (
+        "fmt"
+	hibp "github.com/mattevans/pwned-passwords"
+	"os"
+)
+
+func main() {
+  // Init a client.
+  client := hibp.NewClient()
+
+  // Check to see if your given string is compromised.
+  pwned, err := client.Pwned.Compromised("string to check")
+  if err != nil {
+      fmt.Println("Pwned failed")
+      os.Exit(1)
+  }
+
+  if pwned {
+      // Oh dear!
+      // You should avoid using that password
+  } else {
+     // Woo!
+     // All clear!
+  }
+}
+```
+
+**Expire in-memory cache**
+
+```go
+client.Cache.Expire(HASHED_VALUE)
+```
+
+```go
+client.Cache.ExpireAll()
+```
+
+Contributing
+-----------------
+If you've found a bug or would like to contribute, please create an issue here on GitHub, or better yet fork the project and submit a pull request!