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Auto merge of #3139 - jhbabon:improve-replace-parsing-error-msg, r=alexcrichton

Show an error messager for invalid semver spec for packages in the [replace] section.

The `[replace]` section in the `Cargo.toml` file doesn't allow invalid semver specsfor packages, so something like this:

```toml
[dependencies]
foo = "*"

[replace]
"foo:*" = { git = 'https://example.com' }
```

It's not valid. In this case we will display an error message like this:

```
error: failed to parse manifest at `Cargo.toml`

Caused by:
  replacements must specify a valid semver version to replace, but `foo:*` does not

Caused by:
  Parse error
```

closes #3129

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