Declare required automod dev-dependency

1.0.0 does not work with workspaces.

    error: No such file or directory (os error 2)
     --> test_suite/tests/regression.rs:2:5
      |
    2 |     automod::dir!("tests/regression");
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      |
      = note: this error originates in the macro `automod::dir` (in Nightly builds, run with -Z macro-backtrace for more info)

test_suite/Cargo.toml

@@ -12,7 +12,7 @@ unstable = ["serde/unstable"]
 serde = { path = "../serde" }
 
 [dev-dependencies]
-automod = "1.0"
+automod = "1.0.1"
 fnv = "1.0"
 rustversion = "1.0"
 serde = { path = "../serde", features = ["rc", "derive"] }