Conditional replacements

[Blacksmoke16]

Within the install instructions of my project I have a README.md file that includes a version constraint:

## Installation

First, install the component by adding the following to your `shard.yml`, then running `shards install`:

```yaml
dependencies:
  athena-clock:
    github: athena-framework/clock
    version: ~> 0.2.0
```

Because I want to encourage users to follow semver, I keep it like this even if there is a 0.2.1, etc. version released. However I want to be sure to update this on a minor release. It would be helpful if the replacements feature was conditional, something along the lines of:

- path: src/components/clock/docs/README.md
  find: '    version: ~> .*'
  replace: '    version: ~> {{.Major}}.{{.Minor}}.0'
  on: minor

Such that it would only get replaced on a major or minor version bump.

[Blacksmoke16]

Actually after typing this out I realized it doesn't have to be conditional. I could just have it run every time and would only ever actually change when I actually do a major/minor bump. Otherwise it would just replace it with the same thing.

[miniscruff]

haha yea, I was typing that out. You could do a go template if check if you really wanted to.