Update cfg-if requirement from ^0.1 to ^1.0 (#362)

Updates the requirements on [cfg-if](https://github.com/alexcrichton/cfg-if) to permit the latest version.
- [Release notes](https://github.com/alexcrichton/cfg-if/releases)
- [Commits](rust-lang/cfg-if@0.1.1...1.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.toml

@@ -25,7 +25,7 @@ process = ["libc", "procfs"]
 push = ["reqwest", "libc", "protobuf"]
 
 [dependencies]
-cfg-if = "^0.1"
+cfg-if = "^1.0"
 fnv = "^1.0"
 lazy_static = "^1.4"
 libc = { version = "^0.2", optional = true }