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Update CHANGELOG.md for #48

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CHANGELOG.md
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@ -2,6 +2,22 @@
## Breaking changes
### Add `parse(from_occurrences)` parser adn don't special case `u64` by @SergioBenitez
If you are using a `u64` in your struct to get the number of occurence of a flag, you should now add `parse(from_occurrences)` on the flag.
For example
```rust
#[structopt(short = "v", long = "verbose")]
verbose: u64,
```
must be changed by
```rust
#[structopt(short = "v", long = "verbose", parse(from_occurrences))]
verbose: u64,
```
This feature was surprising as shown in #30. Using the `parse` feature seems much more natural.
## Other