Nathan van DoornandGitHub 41f38fbb4b nix-channel documentation: don't suggest deprecated function ...

Running `nix-instantiate --eval -E '(import <nixpkgs> {}).lib.nixpkgsVersion` emits a warning
```
trace: `lib.nixpkgsVersion` is deprecated, use `lib.version` instead!
```

2018-07-16 10:00:42 +01:00

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nix-channel documentation: don't suggest deprecated function

2018-07-16 10:00:42 +01:00