nimble install fails if the package name is `version`
Hello,

I happen to have a Nim package named `version`: https://github.com/kaushalmodi/version

I haven't built that package in a long time (last time I built it was using the nimble exec that shipped with Nim 1.2.0).

Today, when I run `nimble install` after cloning that git repo, I get:

> Error: Could not read package info file in /home/kmodi/sandbox/nim/version/version.nimble;
> /home/kmodi/sandbox/nim/version/version.nimble(3, 1) Error: expression 'version' has no type (or is ambiguous)

![image](https://user-images.githubusercontent.com/3578197/162862347-56e94d68-e866-4dd6-89a9-4a696f90d69c.png)

### Contents of `version.nimble` ([link](https://github.com/kaushalmodi/version/blob/master/version.nimble))

```
# Package

version       = "0.4.0"
author        = "Kaushal Modi"
description   = "Fetch/parse the version of most CLI apps"
license       = "MIT"
srcDir        = "src"
installExt    = @["nim"]
bin           = @["version"]

# Dependencies

requires "nim >= 1.2.0"
```

### `nimble --version`

```
nimble v0.13.1 compiled at 2022-04-11 02:33:57
git hash: d13f3b8ce288b4dc8c34c219a4e050aaeaf43fc9
```

### `nim --version`

```
Nim Compiler Version 1.7.1 [Linux: amd64]
Compiled at 2022-04-11
Copyright (c) 2006-2022 by Andreas Rumpf

git hash: a77ffdb7ea4ec66983d3481cc486c821a5df6b1b
active boot switches: -d:release
```