Update license script README (flutter/engine#5890)

Note that the license script won't work if there are untracked files
This commit is contained in:
liyuqian 2018-07-27 14:12:50 -07:00 committed by GitHub
parent cadef801db
commit 543ac43471

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@ -16,3 +16,5 @@ pub get
gclient sync
dart lib/main.dart --release --src ../../.. --out ../../../out/licenses > ../../sky/packages/sky_engine/LICENSE
```
**In order for the license script to work, please remove all untracked files inside `engine/src` (not just `engine/src/flutter`)**