flowconfig [ignore] not working

I am ignoring test files and gif files using [ignore] of flowconfig but it's not ignoring
**Error for GIF file**: Malformed Unicode

**Project structure**
```
/root
/node_modules
/src
/component
index.js
index.test.js
index.gif
flowconfig
```

**flowconfig**
```
[ignore]
node_modules
*.test

[libs]
src

[options]
munge_underscores=true
```

```
> flow check

Library parse error:
src/components/Loader/loader.gif:0
Malformed unicode
```