tweak release script for manual prerelease

Author: ryanflorence

package.json

@@ -10,6 +10,7 @@
   ],
   "scripts": {
     "start": "echo 'Make sure to `cd website && npm install`' && cd website && npm run dev",
+    "release": "node ./scripts/release.js",
     "build-lib": "babel ./modules -d . --ignore '__tests__'",
     "build-umd": "webpack modules/index.js umd/react-router.js",
     "build-min": "webpack -p modules/index.js umd/react-router.min.js",

scripts/release.js

@@ -19,7 +19,7 @@ if (process.cwd() !== resolvePath(__dirname, '..')) {
 // is a "pre-release" if nextVersion is premajor, preminor,
 // prepatch, or prerelease
 const nextVersion = prompt(`Next version (current version is ${getPackageVersion()})? `)
-const isPrerelease = nextVersion.substring(0, 3) === 'pre'
+const isPrerelease = nextVersion.substring(0, 3) === 'pre' || nextVersion.indexOf('-') !== -1
 
 // 1) Make sure the tests pass
 exec('npm test -- --single-run')