Vendor dependencies for 0.3.0 release

vendor/encase/tests/trybuild.rs

@@ -0,0 +1,8 @@
+#![cfg(not(miri))] // Can't run (and no point running) trybuild through miri
+
+#[test]
+fn trybuild() {
+    let t = trybuild::TestCases::new();
+    t.pass("tests/pass/*.rs");
+    t.compile_fail("tests/compile_fail/*.rs");
+}