Bump parent pom version to 0.3.1

Update the parent POM version from 0.3.0 to 0.3.1 in pom.xml to pick up upstream build/config changes.

Author: mercyblitz

pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>io.github.microsphere-projects</groupId>
         <artifactId>microsphere-build</artifactId>
-        <version>0.3.0</version>
+        <version>0.3.1</version>
     </parent>
 
     <groupId>io.github.microsphere-projects</groupId>