chore: regenerate README (#342)

This PR was generated using Autosynth. 🌈


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

```
2020-10-27 19:24:24,317 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsublite/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-27 19:24:25,248 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/17b83bd7-2a3c-4f1d-a56f-6b4c89dcf945/targets

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

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-pubsublite.git",
-        "sha": "4d9ae63c2d5fd76a91b67bcaa049c905eaf7390b"
+        "sha": "715f58a170cbf8ca5a825eeeb71dee57e569358f"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "fd3584b01cedd6c9f79d08be4e2365085f955aa5"
+        "sha": "ea52b8a0bd560f72f376efcf45197fb7c8869120"
       }
     }
   ]

README.md

@@ -32,11 +32,11 @@ If you are using Maven, add this to your pom.xml file:
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-pubsublite:0.6.0'
+compile 'com.google.cloud:google-cloud-pubsublite:0.6.1'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-pubsublite" % "0.6.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-pubsublite" % "0.6.1"
 ```
 
 ## Authentication