Update dependencies

Author: eldruin

CHANGELOG.md

@@ -8,6 +8,11 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+- Updated `nix` to version `0.20`.
+- Updated `tokio` to version `1`.
+- Updated `mio` to version `0.7`.
+- Updated `quicli` to version `0.3`.
+
 ## v0.4.0 - 2020-08-01
 
 - Removed pub "errors" module.  Error now exposed at top level.
@@ -18,17 +23,17 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 Refactored Errors:
 - Removed the `error-chain` dependency.
-- Errors are now implemented "manually" with `ErrorKind` and `IoctlKind` enums. 
+- Errors are now implemented "manually" with `ErrorKind` and `IoctlKind` enums.
 - The encompassing `Error` type implements the `std::error::Error` trait.
 
 ## v0.2.0 - 2018-12-12
 
 Adds the ability to create a collection of lines from a single chip and read or write those lines simultaneously with a single stystem call.
- 
+
 - A new `Lines` object (plural) was added. It is a collection of individual `Line` objects on a single `Chip` which can be read or written simultaneously with a single system call.
 - A `Line` now just contains the reference to the Chip and the offset number. No system call is incurred when one is created.
 - Information about an individual line is now represented by a separate `LineInfo` struct which can be obtained from the function `Line::info()`. This incurs a system call to retrieve the information.
-- Creating a `Line` can't fail unless the caller specifies an offset that is out of range of the chip. 
+- Creating a `Line` can't fail unless the caller specifies an offset that is out of range of the chip.
 - The `LineIterator` can not fail since it checks the offset range. So now its item is just a `Line`, and not `Result<Line>`.
 - There was no longer a need for `Line::refresh()` so it was removed.
 - Since a `Line` object is trivial to create, it is now OK to have `Lines` be a simple collection of `Line` structs.

Cargo.toml

@@ -22,13 +22,13 @@ required-features = ["async-tokio"]
 [dependencies]
 bitflags = "1.0"
 libc = "0.2"
-nix = "0.14"
-tokio = { version = "0.2", features = ["io-driver", "rt-threaded", "macros"], optional = true }
+nix = "0.20"
+tokio = { version = "1", features = ["io-util", "rt-multi-thread", "macros"], optional = true }
 futures = { version = "0.3", optional = true }
-mio = { version = "0.6", optional = true }
+mio = { version = "0.7", optional = true }
 
 [dev-dependencies]
-quicli = "0.2"
+quicli = "0.3"
 anyhow = "1.0"
 
 [package.metadata.docs.rs]