vendor: update all dependencies to latest versions

vendor/github.com/nsf/termbox-go/README.md

@@ -14,7 +14,7 @@ There are also some interesting projects using termbox-go:
  - [sokoban-go](https://github.com/rn2dy/sokoban-go) is an implementation of sokoban game.
  - [hecate](https://github.com/evanmiller/hecate) is a hex editor designed by Satan.
  - [httopd](https://github.com/verdverm/httopd) is top for httpd logs.
- - [mop](https://github.com/michaeldv/mop) is stock market tracker for hackers.
+ - [mop](https://github.com/mop-tracker/mop) is stock market tracker for hackers.
  - [termui](https://github.com/gizak/termui) is a terminal dashboard.
  - [termloop](https://github.com/JoelOtter/termloop) is a terminal game engine.
  - [xterm-color-chart](https://github.com/kutuluk/xterm-color-chart) is a XTerm 256 color chart.
@@ -32,6 +32,7 @@ There are also some interesting projects using termbox-go:
  - [2048-go](https://github.com/1984weed/2048-go) is 2048 in Go
  - [jv](https://github.com/maxzender/jv) helps you view JSON on the command-line.
  - [pinger](https://github.com/hirose31/pinger) helps you to monitor numerous hosts using ICMP ECHO_REQUEST.
+ - [vixl44](https://github.com/sebashwa/vixl44) lets you create pixel art inside your terminal using vim movements
 
 ### API reference
 [godoc.org/github.com/nsf/termbox-go](http://godoc.org/github.com/nsf/termbox-go)