change package name

.github/CONTRIBUTING.md

.travis.yml

README.md

SECURITY.md

accounts/abi/abi.go

accounts/abi/abi_test.go

accounts/abi/bind/auth.go

accounts/abi/bind/backend.go

accounts/abi/bind/backends/simulated.go

accounts/abi/bind/backends/simulated_test.go

accounts/abi/bind/base.go

accounts/abi/bind/base_test.go

accounts/abi/bind/bind.go

accounts/abi/bind/bind_test.go

accounts/abi/bind/template.go

accounts/abi/bind/topics.go

accounts/abi/bind/topics_test.go

accounts/abi/bind/util.go

accounts/abi/bind/util_test.go

accounts/abi/event.go