chore: regenerate README (#636)

This PR was generated using Autosynth. 🌈


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

```
2021-08-19 23:20:18,963 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-speech/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-19 23:20:20,193 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/962cd8b1-c6e0-40f3-94d6-3ab66a2b2123/targets

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Author: yoshi-automation

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-speech.git",
-        "sha": "e2e241782c069796b67ea33bbf96142e62308ada"
+        "sha": "300b9cd275aefdd684d33b0bb92dd14b1e4c90f6"
       }
     },
     {

README.md

@@ -42,7 +42,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-speech</artifactId>
-  <version>1.30.2</version>
+  <version>1.30.3</version>
 </dependency>
 
 ```
@@ -57,13 +57,13 @@ compile 'com.google.cloud:google-cloud-speech'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-speech:1.30.2'
+compile 'com.google.cloud:google-cloud-speech:1.30.3'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "1.30.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "1.30.3"
 ```
 
 ## Authentication