chore(cd): corrected the orded of lerna-semantic-release commands
chore(cd): corrected the orded of lerna-semantic-release commands

affects: serenity-js

So that the changelog is included in the package published to the NPM the \`post\` step needs to be
invoked _before_ the \`perform\` step.
See: atlassian/lerna-semantic-release#52

jan-molak/serenity-js,InvictusMB/serenity-js,red6/serenity-js,InvictusMB/serenity-js,jan-molak/serenity-js,red6/serenity-js,InvictusMB/serenity-js,InvictusMB/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js,red6/serenity-js,red6/serenity-js