[misc] bump SNAPSHOT version

Author: rusher

pom.xml

@@ -7,7 +7,7 @@
  <artifactId>mariadb-java-client</artifactId>
  <packaging>jar</packaging>
  <name>mariadb-java-client</name>
- <version>3.1.4</version>
+ <version>3.1.5-SNAPSHOT</version>
  <description>JDBC driver for MariaDB and MySQL</description>
  <url>https://mariadb.com/kb/en/mariadb/about-mariadb-connector-j/</url>