upgrade druid to 1.1.5

pom.xml

@@ -254,7 +254,7 @@
             <dependency>
                 <groupId>com.alibaba</groupId>
                 <artifactId>druid</artifactId>
-                <version>1.1.5-preview_14</version>
+                <version>1.1.5</version>
             </dependency>
             <!-- log -->
             <dependency>