work around broken ava timeout

Author: bakkot

package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "build": "echo nothing to build",
     "lint": "eslint .",
-    "test": "ava test/*"
+    "test": "ava test/* --timeout=30s"
   },
   "dependencies": {
     "shift-ast": "^7.0.0",

test/valid-subtrees.js

@@ -51,7 +51,6 @@ function isValidButSubtreeIsNotValid(tree) {
 
 test('fuzzing: all subtrees of random trees are valid and well-formed', async t => {
   t.plan(0);
-  t.timeout(30e3); // 30 second
   outer: for (let i = 0; i < 100; ++i) {
     let tree = (Math.random() < 0.5 ? fuzzScript : fuzzModule)();
     if (!valid(tree)) {