Solved issue of wrong syntax for installing dependency using yarn in readme.

* bump node version to 14

Co-authored-by: Elliot Winkler <elliot.winkler@gmail.com>

* Fixed a typo in the duplicate account import error

* Update index.js

Changed quotations to please the linter

A new vault should be unlocked after being created, because the
password is submitted as part of creating the vault. This was
accidentally broken as part of #148. A unit test has been added to
ensure this doesn't happen again.

The vault password is now always set in the method responsible for
creating the vault. Previously it was set when the vault was persisted,
or when the first keyring was created. This led to redundant calls to
persist the keyrings, just to achieve the side-effect of setting the
password.

This change eliminates those redundant calls, and a few more that had
no obvious purpose.

Note that the password is also set on unlock, and that has not changed
here.

Bumps [@metamask/auto-changelog](https://github.com/MetaMask/auto-changelog) from 2.5.0 to 3.0.0.
- [Release notes](https://github.com/MetaMask/auto-changelog/releases)
- [Changelog](https://github.com/MetaMask/auto-changelog/blob/main/CHANGELOG.md)
- [Commits](MetaMask/auto-changelog@v2.5.0...v3.0.0)

---
updated-dependencies:
- dependency-name: "@metamask/auto-changelog"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

The project has been migrated to Yarn v3. The changes made have been
based off of the module template. `allow-scripts` has been updated to
the latest version as well.

Bumps [@metamask/eth-sig-util](https://github.com/MetaMask/eth-sig-util) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/MetaMask/eth-sig-util/releases)
- [Changelog](https://github.com/MetaMask/eth-sig-util/blob/main/CHANGELOG.md)
- [Commits](MetaMask/eth-sig-util@v4.0.0...v4.0.1)

---
updated-dependencies:
- dependency-name: "@metamask/eth-sig-util"
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

The GitHub actions have been updated to match the module template more
closely. There are still many differences because this library is not
yet using TypeScript, so it doesn't have any build step. It also
doesn't yet have API documentation, so steps relating to that have been
removed.

Release instructions have been added to the README as well.

* 8.0.0

* Update changelog

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Mark Stacey <markjstacey@gmail.com>