Automatic listing of modules versions changed on pipeline release

[JoseEspinosa]

The modules that are updated on pipeline release are currently manually listed on the CHANGELOG.md see here.

As discussed on this PR, it might be nice to implement an automatic listing of the module versions that have been changed on pipeline release. The idea would be, as suggested by @drpatelh, to list the container address in modules.json and try and look for a diff between releases to get an automated listing of what has changed instead of getting the info manually.

[ewels]

This is quite challenging, because it involves writing content to the changelog. When should that happen? Where? Very easy to get wrong..

As a compromise, we could maybe have a glorified regex to look at a git diff and build the markdown table and spit it to the terminal, where it could be copied manually into the changelog. Would that be ok?

For example, something like this (where the positional argument would be used within a git diff internally, typically master assuming that this holds the latest release and we're on dev):

$ nf-core modules list-dep-changes master

| Dependency    | Old version | New version |
|---------------|-------------|-------------|
| `bbmap`       |             | 38.93       |
| `hisat2`      | 2.2.0       | 2.2.1       |
| `picard`      | 2.23.9      | 2.25.7      |
| `salmon`      | 1.4.0       | 1.5.2       |
| `samtools`    | 1.12        | 1.13        |
| `sortmerna`   | 4.2.0       | 4.3.4       |
| `trim-galore` | 0.6.6       | 0.6.7       |

NB: Could probably use rich to generate the tabular structure fairly easily 🤔 I could see this being a pain with prettier linting..