chore: regenerate README (#153)

This PR was generated using Autosynth. 🌈


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

```
2020-10-31 08:10:15,431 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-mediatranslation/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-31 08:10:16,365 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

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https://source.cloud.google.com/results/invocations/075d4c24-2a6e-4600-83ed-206b1020367a/targets

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-mediatranslation.git",
-        "sha": "f978a5f9903a7c885f70af7ab2479bd77c9fd28e"
+        "sha": "d1a8c0d9b8a40e92d00412982049647bb4afb98f"
       }
     },
     {

README.md

@@ -27,11 +27,11 @@ 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-mediatranslation:0.2.2'
+compile 'com.google.cloud:google-cloud-mediatranslation:0.2.4'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-mediatranslation" % "0.2.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-mediatranslation" % "0.2.4"
 ```
 
 ## Authentication