Update README.md

README.md

 # renovate
 
-Keeping npm dependencies up-to-date.
+Keep npm dependencies up-to-date.
 
 ## Before you Start
 
 To run this script, you will need to select a GitHub account for it to use. The account will need read/write access to push and update upgrade branches to GitHub, as well as raise Pull Requests.
 
-We recommend to use a named "bot" account so that it's clear to other users of the repository that these are automated actions and not a team member performing them all manually.
+We recommend using a "bot" account so that it's clear to other users of the repository that these are automated actions and not a team member performing them all manually.
 
-### GitHub SSH access for git
+The script will need a GitHub "access token" for authenticating API access. You can find instructions for generating it here: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
 
-This script performs git clones, branching and pushing of branches to GitHub using SSH-based authentication. The public key (`~/.ssh/id_rsa.pub`) of wherever you're running the script needs to be manually added to GitHub before the first time you run the script. You can find instructions here: https://help.github.com/articles/adding-a-new-ssh-key-to-your-github-account/
-
-### Personal Access Token for GitHub API access
-
-The script will also need a GitHub "access token" for authenticating API access. You can find instructions for generating it here: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
+This token needs to be exposed via the environment variable `RENOVATE_TOKEN`.
 
 ## Running the Script
 
@@ -25,7 +21,7 @@ First, install dependencies for this script by running `npm install`.
  The script can then be run like this:
 
 ```sh
-node src/index.js <github token> <username>/<repo> <path to package.json>
+node src <username>/<repo> <path to package.json>
 ```
 
 The `<path to package.json>` argument is optional, and is only needed if your `package.json` is located somewhere other than the root of the repository.
@@ -33,11 +29,17 @@ The `<path to package.json>` argument is optional, and is only needed if your `p
 Example of running with default `package.json` location:
 
 ```sh
-node src/index.js JDSUW284HSJDSFKSUS22942H2H15KK singapore/renovate
+node src singapore/renovate
 ```
 
 Example of running with a custom `package.json` location:
 
 ```sh
-node src/index.js JDSUW284HSJDSFKSUS22942H2H15KK singapore/renovate containers/build/package.json
+node src JDSUW284HSJDSFKSUS22942H2H15KK singapore/renovate containers/build/package.json
+```
+
+Note: as mentioned above, you need to expose the environment variable `RENOVATE_TOKEN`. One way of doing it is like this:
+
+```sh
+RENOVATE_TOKEN=JDSUW284HSJDSFKSUS22942H2H15KK node src singpaore/renovate
 ```