Problem with gitPull and sundials
I am trying to download [Sundials v5.0.0-dev.1](https://github.com/LLNL/sundials/tree/v5.0.0-dev.1). For that I am using:
```
  gitPull("https://github.com/LLNL/sundials", outdir = srcDir, plist = """
*
""", checkout = "tags/v5.0.0-dev.1")
```

But I am getting:
```
/usr/lib/nim/system/fatal.nim(39, 5) Error: unhandled exception: /home/jose/.nimble/pkgs/nimterop-#head/nimterop/git.nim(25, 12) `ret == 0` Command failed: (1, false)
ccmd: cd /home/jose/src/nimlang/nim_sundials/sundials && git pull --tags origin master
result:
Desde https://github.com/LLNL/sundials
 * branch            master        -> FETCH_HEAD
 * [nuevo tag]       v2.7.0        -> v2.7.0
 * [nuevo tag]       v3.0.0        -> v3.0.0
 * [nuevo tag]       v3.0.0-beta-2 -> v3.0.0-beta-2
 * [nuevo tag]       v3.1.0        -> v3.1.0
 * [nuevo tag]       v3.1.1        -> v3.1.1
 * [nuevo tag]       v3.1.2        -> v3.1.2
 * [nuevo tag]       v3.2.0        -> v3.2.0
 * [nuevo tag]       v3.2.1        -> v3.2.1
 * [nuevo tag]       v4.0.0        -> v4.0.0
 * [nuevo tag]       v4.0.0-dev    -> v4.0.0-dev
 * [nuevo tag]       v4.0.0-dev.1  -> v4.0.0-dev.1
 * [nuevo tag]       v4.0.0-dev.2  -> v4.0.0-dev.2
 * [nuevo tag]       v4.0.1        -> v4.0.1
 * [nuevo tag]       v4.0.2        -> v4.0.2
 * [nuevo tag]       v4.1.0        -> v4.1.0
 * [nuevo tag]       v5.0.0-dev.0  -> v5.0.0-dev.0
 * [nuevo tag]       v5.0.0-dev.1  -> v5.0.0-dev.1
 * [nueva rama]      master        -> origin/master
error: Sparse checkout leaves no entry on working directory
```
Am I doing something wrong?

I am using:
```
nimble install nimterop@#head
```