Add whatsappmulti buildflag for whatsapp with multidevice support (whatsapp)

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+# go-qrcode #
+
+<img src='https://skip.org/img/nyancat-youtube-qr.png' align='right'>
+
+Package qrcode implements a QR Code encoder. [![Build Status](https://travis-ci.org/skip2/go-qrcode.svg?branch=master)](https://travis-ci.org/skip2/go-qrcode)
+
+A QR Code is a matrix (two-dimensional) barcode. Arbitrary content may be encoded, with URLs being a popular choice :)
+
+Each QR Code contains error recovery information to aid reading damaged or obscured codes. There are four levels of error recovery: Low, medium, high and highest. QR Codes with a higher recovery level are more robust to damage, at the cost of being physically larger.
+
+## Install
+
+    go get -u github.com/skip2/go-qrcode/...
+
+A command-line tool `qrcode` will be built into `$GOPATH/bin/`.
+
+## Usage
+
+    import qrcode "github.com/skip2/go-qrcode"
+
+- **Create a PNG image:**
+
+        var png []byte
+        png, err := qrcode.Encode("https://example.org", qrcode.Medium, 256)
+
+- **Create a PNG image and write to a file:**
+
+        err := qrcode.WriteFile("https://example.org", qrcode.Medium, 256, "qr.png")
+
+- **Create a PNG image with custom colors and write to file:**
+
+        err := qrcode.WriteColorFile("https://example.org", qrcode.Medium, 256, color.Black, color.White, "qr.png")
+
+All examples use the qrcode.Medium error Recovery Level and create a fixed
+256x256px size QR Code. The last function creates a white on black instead of black
+on white QR Code.
+
+The maximum capacity of a QR Code varies according to the content encoded and
+the error recovery level. The maximum capacity is 2,953 bytes, 4,296
+alphanumeric characters, 7,089 numeric digits, or a combination of these.
+
+## Documentation
+
+[![godoc](https://godoc.org/github.com/skip2/go-qrcode?status.png)](https://godoc.org/github.com/skip2/go-qrcode)
+
+## Demoapp
+
+[http://go-qrcode.appspot.com](http://go-qrcode.appspot.com)
+
+## CLI
+
+A command-line tool `qrcode` will be built into `$GOPATH/bin/`.
+
+```
+qrcode -- QR Code encoder in Go
+https://github.com/skip2/go-qrcode
+
+Flags:
+  -o string
+        out PNG file prefix, empty for stdout
+  -s int
+        image size (pixel) (default 256)
+
+Usage:
+  1. Arguments except for flags are joined by " " and used to generate QR code.
+     Default output is STDOUT, pipe to imagemagick command "display" to display
+     on any X server.
+
+       qrcode hello word | display
+
+  2. Save to file if "display" not available:
+
+       qrcode "homepage: https://github.com/skip2/go-qrcode" > out.png
+```
+
+## Links
+
+- [http://en.wikipedia.org/wiki/QR_code](http://en.wikipedia.org/wiki/QR_code)
+- [ISO/IEC 18004:2006](http://www.iso.org/iso/catalogue_detail.htm?csnumber=43655) - Main QR Code specification (approx CHF 198,00)<br>
+- [https://github.com/qpliu/qrencode-go/](https://github.com/qpliu/qrencode-go/) - alternative Go QR encoding library based on [ZXing](https://github.com/zxing/zxing)