Merge pull request #49 from ryankurte/fix/nix-0.14

bump nix to 0.14 to fix libc issues

Author: posborne

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "i2cdev"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Paul Osborne <[email protected]>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-embedded/rust-i2cdev"
@@ -17,7 +17,7 @@ https://www.kernel.org/doc/Documentation/i2c/dev-interface
 libc = "0.2"
 bitflags = "1"
 byteorder = "1"
-nix = "0.11"
+nix = "0.14"
 
 [dev-dependencies]
 docopt = "0.8"