Require version agreement between CLI and dep

One day may be able to relax this but for now its not tenable!

Closes #47

crates/wasm-bindgen-macro/src/ast.rs

@@ -353,6 +353,7 @@ impl Program {
                         ]);
                     })
                 }),
+                ("version", &|a| a.str(&shared::version())),
             ]);
             a.cnt
         };