Update WASM example crate/app

wasm/example/src/main.js

@@ -1,11 +1,6 @@
-import * as py from 'rustpython_wasm';
+import * as rp from 'rustpython_wasm';
 import pyCode from 'raw-loader!./main.py';
 
-fetch('https://github-trending-api.now.sh/repositories')
-    .then(r => r.json())
-    .then(repos => {
-        const result = py.pyEval(pyCode, {
-            vars: { repos }
-        });
-        alert(result);
-    });
+const vm = rp.vmStore.get('main');
+
+vm.exec(pyCode);

wasm/example/src/main.py

@@ -1,8 +1,13 @@
-repos = js_vars['repos']
+from browser import fetch
 
-star_sum = 0
+def fetch_handler(repos):
+    star_sum = 0
+    for repo in repos:
+        star_sum += repo['stars']
+    print(f'Average github trending star count: {star_sum / len(repos)}')
 
-for repo in repos:
-    star_sum += repo['stars']
 
-return 'Average github trending star count: ' + str(star_sum / len(repos))
+fetch(
+    'https://github-trending-api.now.sh/repositories',
+    response_format='json',
+).then(fetch_handler)