Add status badges to each package's README. A few interesting badges are: 1. [Test coverage](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-recommended-bump#readme); 2. [Build status](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-recommended-bump#readme); 3. [Dependency count](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-recommended-bump#readme); 4. [Install size](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-recommended-bump#readme); 5. [npm package version](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-changelog-core#api); Use [shields.io](https://shields.io/badges/npm-version).
