envplate does not work with % signs when using -d flag

### Reproduction

**test.yml**
```
hello % world
```

Run:

```
envplate -d test.yml
```

gives:

```
hello %!!(MISSING)w(MISSING)orld
```

### More information

Issue only with the '-d' flag. It seems fmt.Printf is being used by the logger which does not behave well with % signs (since it expects a type specifier e.g. %s)

