v3.1.0: feat(module): Go module support for 1.11+

• Replaces dep with go mod for dependancy management
• Removes GOPATH setup process, as this is now redundant with go modules
• Requires go 1.11+ (revert to v3.0.0 to support lower versions)

v3.0.0

• Uses dep for dependancy management
• Uses viper for configuraiton
• Uses cobra for CLI commands in cmd package
• Uses zerlog for structured logging
• Configures GOPATH and installs deps