[* Currency] Error recognizing currency range

[lanz0519]

Describe the bug
Regarding the problem of RecognizeCurrency, we used to use the java version, this problem does not exist, but after switching to the c# version found this problem. The problem is that there are some problems with recognizing statements that contain '-' or 'to', whether it is currency or other custom units.

To Reproduce
For the same phrase "15-20 usd"

Return value of java version:

[
    {
        "text": "20 usd",
        "start": 3,
        "end": 8,
        "typeName": "currency",
        "resolution": {
            "isoCurrency": "USD",
            "unit": "United States dollar",
            "value": "20"
        }
    }
]

Return value of .net version
[]
Yes, there is no value
For the other case"15 -20 usd"
Return value of java version:

[
    {
        "text": "20 usd",
        "start": 4,
        "end": 9,
        "typeName": "currency",
        "resolution": {
            "isoCurrency": "USD",
            "unit": "United States dollar",
            "value": "20"
        }
    }
]

Return value of .net version:

[
    {
        "text": "20 usd",
        "start": 4,
        "end": 9,
        "typeName": "currency",
        "resolution": {
            "isoCurrency": "USD",
            "unit": "United States dollar",
            "value": "20"
        }
    }
]

At this time the return value of the .net version is normal again, after testing found that adding spaces before and after '-' or 'to' will make the final recognition result as expected

Expected behavior
We want the .net version to recognize the phrase "15-20 usd" with the message 20 usd, not just two numbers

Platform (please complete the following information):

• Platform: .NET
• Environment: nuget package
• Version of package latest