Merge remote-tracking branch 'origin/master'

# Conflicts:
#	Dockerfile

Author: leebenson

Dockerfile

@@ -18,6 +18,7 @@ RUN apk add --no-cache --virtual .gyp \
     make \
     nasm \
     python \
+    git \
   && npm i \
   && apk del .gyp
 

README.md

@@ -125,6 +125,10 @@ Get the latest updates by following us on Twitter: https://twitter.com/reactql
 
 ### Complete documentation @ **https://reactql.org**
 
-# New to GraphQL?
+# New to GraphQL? Need help?
+
+<img src="https://reactql.org/assets/ext/slack_mark.png" alt="ReactQL" width="70" />
+
+[Join the ReactQL slack channel here.](https://join.slack.com/t/reactql/shared_invite/enQtMjU0MjUzNDEzNzY0LWIyY2MzOGNlYmE1ZjI5ZDZhZTI2ODdiYzM2NjczYzJhZDgxYmJmYzE1NDYzZjRkYmVmNmQ3MzM0NzM3N2M5ODM)
 
 Watch my free [45 minute YouTube video](https://www.youtube.com/watch?v=DNPVqK_woRQ), for a live coding walk-through of putting together a GraphQL server with a database. Learn how to write queries, mutations and handle nested/related data.