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added support for single-line functions (#32)

Single-line functions caused the assertion in updateNonemptyFunc (new: updateMultilineFunc) to panic: we put cursor at the first non-contract statement of the function body and move it back till we expected to reach either a new-line start or a semi-colon (';') indicating the end of the contract block.

However, when a single-line function was given, we would reach the left brace of the function definition like in this function:

```go
func SomeFunc(x int, y int) (result string, err error) { return "" }
```

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397 of 443 relevant lines covered (89.62%)

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