.travis.yml in embulk-output-sftp-0.1.10 vs .travis.yml in embulk-output-sftp-0.1.11

@@ -1,9 +1,8 @@
-dist: precise
+dist: trusty
 language: java
 jdk:
-  - openjdk7
-  - oraclejdk7
+  - openjdk8
   - oraclejdk8
 script:
   - ./gradlew test
 after_success:
   - ./gradlew jacocoTestReport coveralls