Vendor dependencies for 0.3.0 release

vendor/approx/tests/macro_import.rs

@@ -0,0 +1,18 @@
+extern crate approx;
+
+mod test_macro_import {
+    use approx::{
+        assert_abs_diff_eq, assert_abs_diff_ne, assert_relative_eq, assert_relative_ne,
+        assert_ulps_eq, assert_ulps_ne,
+    };
+
+    #[test]
+    fn test() {
+        assert_abs_diff_eq!(1.0f32, 1.0f32);
+        assert_abs_diff_ne!(1.0f32, 2.0f32);
+        assert_relative_eq!(1.0f32, 1.0f32);
+        assert_relative_ne!(1.0f32, 2.0f32);
+        assert_ulps_eq!(1.0f32, 1.0f32);
+        assert_ulps_ne!(1.0f32, 2.0f32);
+    }
+}