golines does not shorten index expressions in declarations

golines will shorten a declaration like this:
```go
foo := longlistfunc(bigarg, otherbigarg, verylongarg, veryverylongarg, veryveryverylongarg, extremelylongarg)
```
to 
```go
foo := longlistfunc(
	bigarg,
	otherbigarg,
	verylongarg,
	veryverylongarg,
	veryveryverylongarg,
	extremelylongarg,
)
```

I would expect it to similarly shorten a declaration like
```go
foo := longlistfunc(bigarg, otherbigarg, verylongarg, veryverylongarg, veryveryverylongarg, extremelylongarg)[0]
```

to
```
foo := longlistfunc(
	bigarg,
	otherbigarg,
	verylongarg,
	veryverylongarg,
	veryveryverylongarg,
	extremelylongarg,
)[0]
```

but it is left alone. This appears to be due to [formatExpr](https://github.com/segmentio/golines/blob/master/shortener.go#L484) not supporting index expressions. It results in a debug message like

```
Got an expression type that can't be shortened: *dst.IndexExpr
```


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golines does not shorten index expressions in declarations #128

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golines does not shorten index expressions in declarations #128

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