Update commit message to use imperative mood (facebook#8377)

Why:

* As per best practice:
  https://git.kernel.org/pub/scm/git/git.git/tree/Documentation/SubmittingPatches#n135

  See also:
  https://chris.beams.io/posts/git-commit/#imperative

packages/react-scripts/scripts/init.js

@@ -53,7 +53,7 @@ function tryGitInit(appPath) {
     didInit = true;
 
     execSync('git add -A', { stdio: 'ignore' });
-    execSync('git commit -m "Initial commit from Create React App"', {
+    execSync('git commit -m "Initialize project using Create React App"', {
       stdio: 'ignore',
     });
     return true;