change version from 3.1.1 to 3.1.0. There is no 3.1.0 exist. (#5581)
change version from 3.1.1 to 3.1.0. There is no 3.1.0 exist. (#5581)

* update version

* parent pom changed since last time so stay with 3.1.0

navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,selvasingh/azure-sdk-for-java,selvasingh/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,navalev/azure-sdk-for-java,selvasingh/azure-sdk-for-java,Azure/azure-sdk-for-java