Fix run-time error in deploy script: clc is not defined

[arayaryoma]

Description

When tried to deploy Firebase Hosting project with firebase deploy --only hosting using firebase-tools v4.2.1, it would be failed because of the error below.

[debug] [2018-09-14T18:35:10.883Z] ----------------------------------------------------------------------
[debug] [2018-09-14T18:35:10.885Z] Command:       dir_to_node/node/v6.14.4/bin/node project_path/node_modules/.bin/firebase deploy --only hosting:staging
[debug] [2018-09-14T18:35:10.886Z] CLI Version:   4.2.1
[debug] [2018-09-14T18:35:10.886Z] Platform:      linux
[debug] [2018-09-14T18:35:10.886Z] Node Version:  v6.14.4
[debug] [2018-09-14T18:35:10.886Z] Time:          Sat Sep 15 2018 03:35:10 GMT+0900 (JST)
[debug] [2018-09-14T18:35:10.886Z] ----------------------------------------------------------------------
[debug] 
[debug] [2018-09-14T18:35:10.893Z] > command requires scopes: ["email","openid","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","https://www.googleapis.com/auth/cloud-platform"]
[debug] [2018-09-14T18:35:10.893Z] > authorizing via signed-in user
[debug] [2018-09-14T18:35:10.895Z] >>> HTTP REQUEST GET https://admin.firebase.com/v1/projects/sample-project  
 
[debug] [2018-09-14T18:35:12.107Z] <<< HTTP RESPONSE 200
[info] 
[info] === Deploying to 'sample-project'...
[info] 
[info] i  deploying hosting
[debug] [2018-09-14T18:35:14.848Z] ReferenceError: clc is not defined
    at project_path/node_modules/firebase-tools/lib/deploy/hosting/prepare.js:45:13
    at arrayEach (project_path/node_modules/lodash/lodash.js:516:11)
    at Function.forEach (project_path/node_modules/lodash/lodash.js:9344:14)
    at module.exports (project_path/node_modules/firebase-tools/lib/deploy/hosting/prepare.js:37:5)
    at _chain (project_path/node_modules/firebase-tools/lib/deploy/index.js:26:38)
    at project_path/node_modules/firebase-tools/lib/deploy/index.js:83:14
    at process._tickDomainCallback (internal/process/next_tick.js:135:7)
[error] 
[error] Error: An unexpected error has occurred.

This PR is fixing this problem.

Scenarios Tested

Sample Commands

[laurenzlong]

Thanks for catching and fixing!

[arayaryoma]

Thank you for merging!