chore: regenerate README (#650)

This PR was generated using Autosynth. 🌈


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

```
2021-04-13 15:47:33,655 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-asset/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-13 15:47:34,962 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/b29e3606-c4c7-4ba8-80d1-7fc334a5e27c/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-asset.git",
-        "sha": "96f14dd358b6bd90a912c36d30a7f49fce9b1fff"
+        "sha": "726fa834c5d5ea97c04096fcd762cb0c105d816c"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0a071b3460344886297a304253bf924aa68ddb7e"
+        "sha": "082e1ca0863b13ada8594fe91845380765da5b70"
       }
     }
   ]

README.md

@@ -52,12 +52,12 @@ compile 'com.google.cloud:google-cloud-asset'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-asset:2.3.3'
+compile 'com.google.cloud:google-cloud-asset:2.3.4'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-asset" % "2.3.3"
+libraryDependencies += "com.google.cloud" % "google-cloud-asset" % "2.3.4"
 ```
 
 ## Authentication