bump to latest `chalk`
Add extra newline at the end of help-cache.std

Without this newline, the template is rendered without a newline at the end. So when you run `grunt help cache`, the output does not have a newline at the end and the shell prompt will be printed at the end of the last line.
Merge pull request #1576 from darabos/patch-1

Add extra newline at the end of help-cache.std