Add `bump` CLI command

Add `bump` command to CLI which will update the version of each package including versions of the related packages under dependencies. The command should bump the package version only if the package version exactly matches the current package version (e.g. `^1.0.4` is ignored, `1.0.4` is replaced).

The `CLI` command should look like this:

```
$ monpo --bump 1.0.5
```


