add license badge and reorganize badges (#924)
add license badge and reorganize badges (#924)


xasx/assertj-core,assertj/assertj-core,joel-costigliola/assertj-core,hazendaz/assertj-core,xasx/assertj-core,hazendaz/assertj-core,ChrisCanCompute/assertj-core,ChrisA89/assertj-core,joel-costigliola/assertj-core,assertj/assertj-core,ChrisA89/assertj-core,ChrisCanCompute/assertj-core