s3ext: update README.md

gpAux/extensions/gps3ext/README.md

+## Build
+
+`make` to build the extension for GPDB.
+
+## Test
+
+### Run Unit Tests
+
+`make -f Makefile.test test`
+
+Some tests need [unite](https://github.com/lij55/unite) to serve the test contents and recevie log.
+
+### Test Code Coverage
+
+`make -f Makefile.test coverage`

gpAux/extensions/gps3ext/README.org

-* Build
-
-  =make= to build the extension for GPDB.
-
-* Test
-** Run Unit Test
-  In order to running test, it need [[https://github.com/GPDBUnite/unite][uniteserver]] to serve the test content and recevie log.
-  =make -f Makefile.test test=
-
-** Test Coverage
-   =make -f Makefile.test coverage=