Merge pull request #157 from lucab/release-0.7.1

cargo: libsystemd release 0.7.1

Author: lucab

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libsystemd"
-version = "0.7.0"
+version = "0.7.1"
 authors = ["Luca Bruno <lucab@lucabruno.net>", "Sebastian Wiesner <sebastian@swsnr.de>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/lucab/libsystemd-rs"