README.md in embulk-input-postgresql-0.8.0 vs README.md in embulk-input-postgresql-0.8.1

@@ -158,5 +158,13 @@
 ## Build
 
 ```
 $ ./gradlew gem
 ```
+
+Running tests:
+
+```
+$ cp ci/travis_postgresql.yml ci/postgresql.yml  # edit this file if necessary
+$ EMBULK_INPUT_POSTGRESQL_TEST_CONFIG=`pwd`/ci/postgresql.yml ./gradlew :embulk-input-postgresql:check --info
+```
+