chore: regenerate README (#790)

This PR was generated using Autosynth. 🌈


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

```
2021-08-11 22:06:59,071 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsub/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-11 22:07:00,397 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/fadba45d-4b74-4ca3-8f93-fe49608c1c9e/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-pubsub.git",
-        "sha": "3f662d44d04eb8cb9675a4746d6fe9074f524874"
+        "sha": "7940378db1394e3c5631ec854fa57b35cfb12094"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "6252f2cd074c38f37b44abe5e96d128733eb1b61"
+        "sha": "7e1f6da50524b5d98eb67adbf6dd0805df54233d"
       }
     }
   ]

README.md

@@ -58,13 +58,13 @@ compile 'com.google.cloud:google-cloud-pubsub'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-pubsub:1.113.8'
+compile 'com.google.cloud:google-cloud-pubsub:1.114.0'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-pubsub" % "1.113.8"
+libraryDependencies += "com.google.cloud" % "google-cloud-pubsub" % "1.114.0"
 ```
 
 ## Authentication