Update to latest versions of worker and cfg-if

[Kakapio]

I was working with this tutorial and noticed a [ERROR] Could not resolve "./index_bg.wasm" error.

Found this issue and realized the template has outdated dependencies.

[nicki-krizek]

The req.cf() changed and now returns Option, so this also has to be modified:

diff --git a/src/lib.rs b/src/lib.rs
index 956901b..12b95f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,8 +8,8 @@ fn log_request(req: &Request) {
         "{} - [{}], located at: {:?}, within: {}",
         Date::now().to_string(),
         req.path(),
-        req.cf().coordinates().unwrap_or_default(),
-        req.cf().region().unwrap_or("unknown region".into())
+        req.cf().expect("req missing cf").coordinates().unwrap_or_default(),
+        req.cf().expect("req missing cf").region().unwrap_or("unknown region".into())
     );
 }