[ImgBot] Optimize images

[imgbot]

Beep boop. Your images are optimized!

Your image file size has been reduced by 30% 🎉

Details

File	Before	After	Percent reduction
/assets/docs/update_flow.png	654.41kb	455.92kb	30.33%

---

Black Lives Matter | 💰 donate | 🎓 learn | ✍🏾 sign

📝 docs | repo | 🙋🏾 issues | 🏅 swag | 🏪 marketplace

[pull-assistant]

Best reviewed: commit by commit

---

Optimal code review plan

     [ImgBot] Optimize images

Powered by Pull Assistant. Last update 5acea99 ... 5acea99. Read the comment docs.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - add changelog comment
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase master