chore: regenerate README (#519)

This PR was generated using Autosynth. 🌈


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

```
2020-11-17 20:35:45,139 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-17 20:35:46,101 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/9c304b9d-0f42-4f0e-94e0-5a931833ba61/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-bigquerydatatransfer.git",
-        "sha": "6c88965c9fb6f6b9079e03b7b6aa6c466fb8570e"
+        "sha": "4c5e6af82fb13a5c623c6107f7db9531e544187c"
       }
     },
     {

README.md

@@ -38,18 +38,18 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquerydatatransfer</artifactId>
-  <version>1.0.18</version>
+  <version>1.0.19</version>
 </dependency>
 
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-bigquerydatatransfer:1.0.18'
+compile 'com.google.cloud:google-cloud-bigquerydatatransfer:1.0.19'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "1.0.18"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "1.0.19"
 ```
 
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