chore: regenerate README (#205)

This PR was generated using Autosynth. 🌈


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

```
2021-03-02 18:28:33,054 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-workflows/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-02 18:28:33,920 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/99386b3e-2be4-48fe-a1d2-04a9417950bf/targets

- [ ] To automatically regenerate this PR, check this box.

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-workflows.git",
-        "sha": "d1281f34a35ea41201380b616c93d33d9bdeeb5f"
+        "sha": "607f9904330c68f624c37d040e2ffc5ab735ef50"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "79ab0b44a2cc7d803d07c107f9faf07729fc4012"
+        "sha": "21da7d9fa02f6916d9f87cf4072b3547b5c72eb5"
       }
     }
   ]

java-workflows/README.md

@@ -27,12 +27,12 @@ If you are using Maven, add this to your pom.xml file:
 
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-workflows:0.2.0'
+compile 'com.google.cloud:google-cloud-workflows:0.2.1'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-workflows" % "0.2.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-workflows" % "0.2.1"
 ```
 
 ## Authentication