Update releases.md

docs/releases.md

@@ -1,12 +1,12 @@
 # How to publish a new theme version
-> be sure to have lerna installed globally (`npm i -g lerna`)
 
 1. Checkout `master` and `git pull upstream master`
+2. Run `yarn install` to make sure you have the latest version of all the dev dependencies
 2. Determine whether the release is a patch, minor (feature) or major
    (breaking). You do this by looking at all of the commits since the last
    release:
    [https://github.com/carbon-design-system/gatsby-theme-carbon/commits/master](https://github.com/carbon-design-system/gatsby-theme-carbon/commits/master)
-3. Type `lerna publish X` where `X` is `patch`, `minor`, or `major` from step 2
+3. Type `yarn release X` where `X` is `patch`, `minor`, or `major` from step 2
 4. `git push upstream master --follow-tags`
 5. Navigate to the theme releases pages and draft a new release:
    [https://github.com/carbon-design-system/gatsby-theme-carbon/releases/new](https://github.com/carbon-design-system/gatsby-theme-carbon/releases/new)