Wasm target check before build (#1689)

* Add `rustup show` check for wasm32 target

* better place for check

* fmt

* clippy fmt

packages/fermi/src/lib.rs

@@ -22,8 +22,6 @@ mod atoms {
     pub use atom::*;
     pub use atomfamily::*;
     pub use atomref::*;
-    pub use selector::*;
-    pub use selectorfamily::*;
 }
 
 pub mod hooks {