chore: regenerate README (#95)

This PR was generated using Autosynth. 🌈


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

```
2021-03-03 00:06:02,204 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsublite-kafka/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-03 00:06:03,092 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/d48b89d9-3fc1-4b7f-bbc3-84487f57f45b/targets

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

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-pubsublite-kafka.git",
-        "sha": "cba8a24e693b559063b3b4ecbb8a27c26ff00c2f"
+        "sha": "c6ca8ab31cf55cbf4d2f0ae09fcf74d18cb943ca"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "8c5628b86cfa8386de7b8fc1675e6b528b552d57"
+        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
       }
     }
   ]

README.md

@@ -20,18 +20,18 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>pubsublite-kafka</artifactId>
-  <version>0.2.1</version>
+  <version>0.2.2</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:pubsublite-kafka:0.2.1'
+compile 'com.google.cloud:pubsublite-kafka:0.2.2'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "pubsublite-kafka" % "0.2.1"
+libraryDependencies += "com.google.cloud" % "pubsublite-kafka" % "0.2.2"
 ```
 
 ## Authentication