Merge #4972

4972: Gzip artifacts r=Veetaha a=Veetaha

[Here is the test release](https://github.com/Veetaha/rust-analyzer/releases/tag/2020-06-21)

Change in size:  `~ 25 MB -> ~ 8 MB (gzipped)`

The time to gzip during the dist build takes a somewhat considerable amount of time tho.
Having already compiled artifacts this takes in debug mode:
```
~/dev/rust-analyzer (feat/gzip-binaries) $ time cargo xtask dist
    Finished dev [unoptimized] target(s) in 0.06s
     Running `target/debug/xtask dist`
> cargo build --manifest-path ./crates/rust-analyzer/Cargo.toml --bin rust-analyzer --release
    Finished release [optimized] target(s) in 0.05s
> strip ./target/release/rust-analyzer

real    0m34.331s
user    0m34.245s
sys     0m0.078s
```
In release mode this is much faster:
```
~/dev/rust-analyzer (feat/gzip-binaries) $ time cargo run -p xtask --release -- dist
    Finished release [optimized] target(s) in 0.04s
     Running `target/release/xtask dist`
> cargo build --manifest-path ./crates/rust-analyzer/Cargo.toml --bin rust-analyzer --release
    Finished release [optimized] target(s) in 0.06s
> strip ./target/release/rust-analyzer

real    0m2.401s
```

**[UPD]** adding a profile override for `miniz_oxide` does the thing to ensure good performrance

We might need to notify all other ra plugins' maintainers about the change in our GH releases if we merge this PR, or we could leave uncompressed files along with gzipped for a while until everyone migrates.

Co-authored-by: Veetaha <[email protected]>

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