chore: regenerate README (#366)

This PR was generated using Autosynth. 🌈


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

```
2020-11-19 17:41:46,362 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-speech/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-19 17:41:47,404 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/3f3d201c-6b96-47d4-b1b8-b86969ba1e50/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-speech.git",
-        "sha": "b8ea68c8bc511c79f918b76bbf9ed5f49d49d829"
+        "sha": "505bc423db9ec9ad744cd32da17844c9b4ed7df2"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "39b7149da4026765385403632db3c6f63db96b2c"
+        "sha": "a073c873f3928c561bdf87fdfbf1d081d1998984"
       }
     }
   ]

README.md

@@ -39,7 +39,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-speech</artifactId>
-  <version>1.24.6</version>
+  <version>1.24.7</version>
 </dependency>
 
 ```