Semantic release not updating version in package.json

[nokome]

Semantic release is creating a git tag and updating CHANGELOG, but is not updating the version in package.json. This affects all our repos using @stencila/semantic-release-config. For example in Encoda:

nokome@pluto ~/s/s/encoda (master)> git describe --tags
v0.60.3
nokome@pluto ~/s/s/encoda (master)> cat package.json | grep version
  "version": "0.59.2",

The current version in package.json was updated by me manually, some time ago when I first noticed this bug.

It can be confirmed to be due to moving to using this repo:

• in commit 4c9add1b2b2be574a88f0d792158112c21c846a1 stencila-ci incremented the version in package.json and added the v0.50.0 git tag
• in the next commit 3b6ac04bf5749a0b18f6f0645fa1a03d40ee3589 we changed the semantic release config to be "extends": "@stencila/semantic-release-config"
• in the next release f13405229432735cc52b24a66dc3fe61fd1499c5 the CHANGELOG is updated, but not package.json

I think this may have to do with how https://github.com/semantic-release/npm resolves which package.json to update.