chore: regenerate README (#452)

This PR was generated using Autosynth. 🌈


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

```
2021-02-26 01:24:38,542 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-speech/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-26 01:24:40,213 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/ca0aa061-2daa-486a-bc71-22ccaf0ddeb3/targets

- [ ] To automatically regenerate this PR, check this box.

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-speech.git",
-        "sha": "9a3704249b2215dcfd00b4ed953b42ef9bd9c914"
+        "sha": "ec4b721cb17bf1478a4d0c3e10419beaa5ada6b7"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0199c79b8324fba66476300824aa931788c47e2d"
+        "sha": "8c5628b86cfa8386de7b8fc1675e6b528b552d57"
       }
     }
   ]

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>1.25.0</version>
+  <version>1.25.1</version>
 </dependency>
 
 ```
@@ -52,12 +52,12 @@ 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:1.25.0'
+compile 'com.google.cloud:google-cloud-speech:1.25.1'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "1.25.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-speech" % "1.25.1"
 ```
 
 ## Authentication