Example
---
```rust
fn test(arg: &mut i32) {
    arg = $02;
}
```

**Before this PR**

```rust
fn test(arg: &mut i32) {
    arg = &mut 2;
}
```

**After this PR**

```rust
fn test(arg: &mut i32) {
    *arg = 2;
}
```

Co-authored-by: Chayim Refael Friedman <chayimfr@gmail.com>

fix: Try to improve completion ranking

Kill proc-macro-srv processes on shutdown

fix: use add deref in assign instead add `&mut` for value