fix(changelog): update links to some PRs
fix(changelog): update links to some PRs

Replace /pulls/:id wtih /pull/:id

boneskull/mocha,igwejk/mocha,mochajs/mocha,boneskull/mocha,adamgruber/mocha,mochajs/mocha,mochajs/mocha,outsideris/mocha,igwejk/mocha,outsideris/mocha,boneskull/mocha,adamgruber/mocha,adamgruber/mocha