Fix cargo dependency version specifications

Firstly, the libnitrokey API contains breaking changes between minor
versions.  Therefore we have to fix the nitrokey-sys version using a
tilde requirement ("~3.4" means ">= 3.4.0, < 3.5.0").

Secondly, nitrokey-test’s 0.2.1 release requires some changes that are
not yet implemented in this crate, so we have to pin its version to
0.2.0.

1 files changed, 2 insertions, 2 deletions

diff --git a/Cargo.toml b/Cargo.toml
index a9643db..355f001 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,9 +18,9 @@ exclude = [".builds/*"]
 
 [dependencies]
 libc = "0.2"
-nitrokey-sys = "3.4"
+nitrokey-sys = "~3.4"
 rand_core = {version = "0.3", default-features = false, features = ["std"] }
 rand_os = {version = "0.1"}
 
 [dev-dependencies]
-nitrokey-test = {version = "0.2"}
+nitrokey-test = {version = "=0.2.0"}