aelf(ELF) V1.2.1 Upgrade

We are thrilled to announce that an upgrade to aelf v1.2.1 is on schedule and will be carried out on August 23, 2022. aelf v1.2.1 will upgrade the naming policy of JSON response to UpperCamelCase.
In the previous aelf v1.2.0, some frameworks were upgraded to improve network performance and Web API JSON responses were in camelCase. To boost developer experience, the latest version (v1.2.1) will have that changed back to UpperCamelCase, capitalizing the first letter of every key.
Once aelf v1.2.1 is released, all the production nodes will be required to upgrade to the latest version or its mirror version.