illwill package not being found by nimble
I came across Illwill on Reddit and I was going to install it as it looks pretty nice and handy to me but Nimble was unable to install the package. 

Output:
```
PS D:\Programming\Skirmish\PidPad> nimble install illwill
    Prompt: No local packages.json found, download it from internet? [y/N]
    Answer: y
Downloading Official package list
    Success Package list downloaded.
    Prompt: illwill not found in any local packages.json, check internet for updated packages? [y/N]
    Answer: y
Downloading Official package list
    Success Package list downloaded.
       Tip: 4 messages have been suppressed, use --verbose to show them.
     Error: Package not found.
```
Verbose output:
```
PS D:\Programming\Skirmish\PidPad> nimble install illwill --verbose
    Reading official package list
    Prompt: illwill not found in any local packages.json, check internet for updated packages? [y/N]
    Answer: y
Downloading Official package list
     Trying https://github.com/nim-lang/packages/raw/master/packages.json
    Success Package list downloaded.
    Reading official package list
     Error: Package not found.
```

OS: Windows 10  Build 17763
Nim Version: 0.19.4
Nimble Version: 
```
nimble v0.9.0 compiled at 2019-02-01 05:47:11 git hash: e60ab125494a231c6db3c7cd5122868a0d204b58
```