make sure getrandom has the std feature enabled

This fixes a build failure on Windows.

Author: pietroalbini

CHANGELOG.md

@@ -5,6 +5,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+- Building Rustwide failed on Windows due to a missing feature flag on the
+  getrandom crate.
+
 ## [0.3.0] - 2019-09-23
 
 ### Added

Cargo.toml

@@ -41,7 +41,7 @@ toml = "0.4.6"
 fs2 = "0.4.3"
 remove_dir_all = "0.5.2"
 base64 = "0.10.1"
-getrandom = "0.1.12"
+getrandom = { version = "0.1.12", features = ["std"] }
 
 [dev-dependencies]
 env_logger = "0.6.1"