chore: regenerate README (#925)

This PR was generated using Autosynth. 🌈


Log from Synthtool

```
2021-07-08 11:44:30,605 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-08 11:44:32,155 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```


Full log will be available here:
https://source.cloud.google.com/results/invocations/ef535ed9-63ce-4b8a-a914-85e9992e5274/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Author: yoshi-automation

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerydatatransfer.git",
-        "sha": "6068247ca8e3d4d935fe7adc199c8604e7ea1ed0"
+        "sha": "122ece7b733512e7b419ba10fd67097df155f7ff"
       }
     },
     {

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloudgroupId>
   <artifactId>google-cloud-bigquerydatatransferartifactId>
-  <version>1.3.7version>
+  <version>1.3.10version>
 dependency>
 
 ```
@@ -51,12 +51,12 @@ compile 'com.google.cloud:google-cloud-bigquerydatatransfer'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-bigquerydatatransfer:1.3.7'
+compile 'com.google.cloud:google-cloud-bigquerydatatransfer:1.3.10'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "1.3.7"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "1.3.10"
 ```
 
 ## Authentication