Merge pull request #276 from logankilpatrick/patch-1

Update Slack URL

README.md

@@ -7,7 +7,7 @@
 Functionality based on a dedicated build of ffmpeg via [FFMPEG.jl](https://github.com/JuliaIO/FFMPEG.jl) (based on the cross-platform [FFMPEGBuilder](https://github.com/JuliaIO/FFMPEGBuilder))
 
 **Docs** 
-[![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] [![Join the julia slack](https://img.shields.io/badge/chat-slack%23video-yellow.svg)](https://slackinvite.julialang.org)
+[![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] [![Join the julia slack](https://img.shields.io/badge/chat-slack%23video-yellow.svg)](https://julialang.org/slack/)
 
 | **Platform**                                                               | **Build Status**                                                                                |
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