Fix CI tests.

Author: jmdobry

package.json

@@ -45,7 +45,7 @@
  ]
  },
  "scripts": {
- "ava": "ava --match='!*: dependencies should install*'",
+ "ava": "ava --match='!*: dependencies should install*' --timeout=1m --fail-fast --concurrency=5",
  "ava:deps": "npm run deps_appengine && npm run ava",
  "cover": "npm run deps_appengine && nyc ava --match='!*: dependencies should install*'",
  "deps_appengine": "ava --match='*: dependencies should install*'",
@@ -74,7 +74,7 @@
  },
  "devDependencies": {
  "async": "^1.5.2",
- "ava": "^0.14.0",
+ "ava": "^0.15.2",
  "codecov": "^1.0.1",
  "nodejs-repo-tools": "git+https://github.com/GoogleCloudPlatform/nodejs-repo-tools.git#bbbb6035d77671eb053dbe6b6f0e3ff983f79639",
  "nyc": "^6.4.4",