CLI: Remove message 'This might take a while'

Summary: We now show the npm progress bar.

Reviewed By: mkonicek

Differential Revision:
D4307964
Ninja: OSS only, nit

fbshipit-source-id: 7338ab08abe8cf6354f9a9c6d36c51b0cffc69ee

react-native-cli/index.js

@@ -277,7 +277,7 @@ function run(root, projectName, options) {
         installCommand += ' --verbose';
       }
     } else {
-      console.log('Installing ' + getInstallPackage(rnPackage) + '. This might take a while...');
+      console.log('Installing ' + getInstallPackage(rnPackage) + '...');
       if (!forceNpmClient) {
         console.log('Consider installing yarn to make this faster: https://yarnpkg.com');
       }