chore(apps:info): Remove deprecation warning (#1671)

This should have been removed long time ago, when [I added this warning](8c4ed7e), but never came back to this: .

Thank you to @BigAlUK for raising this issue in [Slack](https://heroku.slack.com/archives/C012K4TFP61/p1604075283179500)

packages/apps-v5/src/commands/apps/info.js

@@ -19,8 +19,7 @@ function * run (context, heroku) {
       }),
       dynos: heroku.get(`/apps/${app}/dynos`).catch(() => []),
       collaborators: heroku.get(`/apps/${app}/collaborators`).catch(() => []),
-      pipeline_coupling: pipelineCouplings,
-      pipeline: pipelineCouplings // TODO: Remove this key once we feel comfortable with https://github.com/heroku/heroku-apps/pull/207#issuecomment-335775852.
+      pipeline_coupling: pipelineCouplings
     }
 
     if (context.flags.extended) {
@@ -117,7 +116,6 @@ function * run (context, heroku) {
     shell()
   } else if (context.flags.json) {
     cli.styledJSON(info)
-    cli.warn('DEPRECATION WARNING: `pipeline` key will be removed in favor of `pipeline_coupling`')
   } else {
     print()
   }

packages/apps-v5/test/commands/apps/info.js

@@ -232,7 +232,6 @@ stack=cedar-14
       .get('/apps/myapp/collaborators').reply(200, collaborators)
       .get('/apps/myapp/dynos').reply(200, [{ type: 'web', size: 'Standard-1X', quantity: 2 }])
     return cmd.run({ args: { app: 'myapp' }, flags: { json: true, extended: true } })
-      .then(() => expect(unwrap(cli.stderr)).to.equal('DEPRECATION WARNING: `pipeline` key will be removed in favor of `pipeline_coupling`\n'))
       .then(() => {
         let json = JSON.parse(cli.stdout)
         expect(json.appExtended).to.equal(undefined)
@@ -254,7 +253,6 @@ stack=cedar-14
       .get('/apps/myapp/dynos').reply(200, [{ type: 'web', size: 'Standard-1X', quantity: 2 }])
       .get('/apps/myapp/pipeline-couplings').reply(200, { app: { id: appAcm.id }, pipeline: { name: 'my-pipeline' } })
     return cmd.run({ args: { app: 'myapp' }, flags: { json: true } })
-      .then(() => expect(unwrap(cli.stderr)).to.equal('DEPRECATION WARNING: `pipeline` key will be removed in favor of `pipeline_coupling`\n'))
       .then(() => {
         let json = JSON.parse(cli.stdout)
         expect(json.appExtended).to.equal(undefined)