Change Slack link to #buildpacks channel
Change Slack link to #buildpacks channel

[#136438447]

Signed-off-by: Keaty <ba27100af1ae477f2abedd28f15b1dd208b1f48a@pivotal.io>

pkumar-appd/nodejs-buildpack,pkumar-appd/nodejs-buildpack,cloudfoundry/nodejs-buildpack,kauffecup/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,ks2software/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,ks2software/nodejs-buildpack,pkumar-appd/nodejs-buildpack,kauffecup/nodejs-buildpack,kauffecup/nodejs-buildpack,ks2software/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,ks2software/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,ks2software/nodejs-buildpack,ks2software/nodejs-buildpack,ks2software/nodejs-buildpack,cloudfoundry/nodejs-buildpack