[ruby-core:93934] [Ruby master Bug#15244] Method #extname return empty string if filename is dot ('.')

Issue #15244 has been updated by rushsteve1 (Steven vanZyl).

File dot-names.diff added

The issue seemed to be in how .dotfiles were handled, where all leading periods were trimmed when only the first should have been.

I've created a patch that seems to fix the issue and added a spect test for it. It's only a 2 line change.

This is my first patch submission so any and all feedback would be greatly appreciated.

----------------------------------------
Bug #15244: Method #extname return empty string if filename is dot ('.')
https://bugs.ruby-lang.org/issues/15244#change-80090

* Author: TiSer (Sergey TiSer)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0p0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
### Example 1:
Current behaviour:
```
File.extname('..jpg')
=> ""
```

Expected behaviour: 
```
File.extname('..jpg')
=> ".jpg"
```


### Example 2:
Current behaviour:
```
File.extname('....jpg')
=> ""
```

Expected behaviour: 
```
=> ".jpg"
```

---Files--------------------------------
dot-names.diff (885 Bytes)


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