add trial (#2779)

fixed adding trial issue

README.md

@@ -1536,6 +1536,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
     * [Testify](https://github.com/stretchr/testify) - Sacred extension to the standard go testing package.
     * [testmd](https://godoc.org/github.com/tvastar/test/cmd/testmd) - Convert markdown snippets into testable go code.
     * [testsql](https://github.com/zhulongcheng/testsql) - Generate test data from SQL files before testing and clear it after finished.
+    * [trial](https://github.com/jgroeneveld/trial) - Quick and easy extendable assertions without introducing much boilerplate.
     * [Tt](https://github.com/vcaesar/tt) - Simple and colorful test tools.
     * [wstest](https://github.com/posener/wstest) - Websocket client for unit-testing a websocket http.Handler.