Update README.md: Upgrade server version used by Travis CI (#375)

Author: sitingren

README.md

@@ -11,7 +11,7 @@
 
 Please check out [release notes](https://github.com/vertica/vertica-python/releases) to learn about the latest improvements.
 
-vertica-python has been tested with Vertica 9.3.1 and Python 2.7/3.4/3.5/3.6/3.7/3.8. Feel free to submit issues and/or pull requests (Read up on our [contributing guidelines](#contributing-guidelines)).
+vertica-python has been tested with Vertica 10.0.0 and Python 2.7/3.4/3.5/3.6/3.7/3.8. Feel free to submit issues and/or pull requests (Read up on our [contributing guidelines](#contributing-guidelines)).
 
 
 ## Installation