Bump nix from 0.16.1 to 0.20.2dependabot/cargo/nix-0.20.2

Bumps [nix](https://github.com/nix-rust/nix) from 0.16.1 to 0.20.2.
- [Release notes](https://github.com/nix-rust/nix/releases)
- [Changelog](https://github.com/nix-rust/nix/blob/v0.20.2/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/compare/v0.16.1...v0.20.2)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

2 files changed, 98 insertions, 83 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 4fcf015..1daee83 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,257 +1,272 @@
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 # It is not intended for manual editing.
+version = 3
+
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- "unicode-segmentation 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 [[package]]
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diff --git a/Cargo.toml b/Cargo.toml
index 8679b8e..1b8da3c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ signal-hook-registry = "1.2.0"
 termion = "1.5.3"
 libc = "0.2.62"
 unicode-segmentation = "1.2.1"
-nix = "0.16.1"
+nix = "0.20.2"
 cassowary = "^0.3.0"
 
 [profile.release]