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Change the builders so that they are now mutably borrowed, accepting
`&mut self` instead of `self`. Their methods now return `()` instead of
`Self`.
Upgrade path:
Change code such as the following:
```rust
channel.send_message(|m| m
.embed(|e| e
.description("test")
.title("title")));
```
to the following style:
```rust
channel.send_message(|mut m| {
m.embed(|mut e| {
e.description("test");
e.title("title");
e
});
m
});
```
Closes #159.
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