Formatting failure with zero-width space

Test case:

```java
package test;

import com.google.common.util.concurrent.AtomicLongMap;

class Foo {
AtomicLongMap a = AtomicLongMap.create().getAndIncrement​("foo");
}
```

Error:

`src/Test.java:6:30: error: expected token: 'getAndIncrement​'; generated getAndIncrement instead`

Version:

google-java-format --version
google-java-format: Version 1.6