Update 20190831-newfeature.md

[JLKwong]

Description

Update Step 3 in newfeature.md to reflect new syntax in the README.md and help.sh files.

Screenshot

Proposed Solution

Rewrite the text to read:

* Your entry should look like this: `temperature [fahrenheit|kelvin]       displays raspberry pi's CPU temperature`

2. help.sh: Now go into cli/modules and modify the help.sh file in the exact same way you modified the README.md file, near the rest of the commands.