ci: test in [email protected] (#40)

Author: teppeis

.travis.yml

@@ -11,7 +11,9 @@ script:
   - npm test
   - npm install --no-save [email protected]
   - npm test
-  - npm install --no-save typescript
+  - npm install --no-save [email protected]
+  - npm test
+  - npm install --no-save typescript@rc
   - npm test
 cache:
   directories: