chore: regenerate README (#226)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2021-04-09 22:30:54,922 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-workflows/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-09 22:30:56,171 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/4c4db8a0-7027-479b-98ff-f4244f3a4797/targets

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java-workflows/.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-workflows.git",
-        "sha": "f3abba3cd3ac823054bef16b7bb51adfab229987"
+        "sha": "edb06f32ce915cc1994f7993951ba013bebb8759"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1f5e6bc8dc8e3661ee550905fc070e55e1b6cea1"
+        "sha": "d9ddac83a22a600dd33854c9d835a4fe52284207"
       }
     }
   ]

java-workflows/README.md

@@ -8,12 +8,9 @@ Java idiomatic client for [Cloud Workflows][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
-
 > Note: This client is a work-in-progress, and may occasionally
 > make backwards-incompatible changes.
 
-
-
 ## Quickstart