Auto merge of #21347 - servo:paulrouget-patch-1, r=jdm

Update README.md

Adding a note about how to skip libsimpleservo compilation.

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bors-servo 2018-08-07 14:48:43 -04:00 committed by GitHub
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@ -225,6 +225,8 @@ real-world use, add the `--release` flag to create an optimized build:
./mach run --release tests/html/about-mozilla.html
```
**Note:** `mach build ` will build both `servo` and `libsimpleservo`. To make compilation a bit faster, it's possible to only compile the servo binary: `./mach build --dev -p servo`.
### Checking for build errors, without building
If youre making changes to one crate that cause build errors in another crate,