v6.4.0

• 🐛 remove logic to speed up multiple invocations of go generate in a single package; if you need the prior behavior, please adopt counterfeiter:generate directives (#170 via @rittneje, fixes #166)
• 🆕 add -q flag to suppress status output (#167 via @martinxsliu)
• ⬆️ dependencies
• 🔁 update CI to use go 1.16

Detailed changes: v6.3.0...v6.4.0