chore: regenerate README (#466)

This PR was generated using Autosynth. 🌈


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

```
2021-02-19 18:56:18,564 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-automl/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-19 18:56:20,155 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/6a819a2c-214b-4918-bd0b-51cafefdc970/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-automl.git",
-        "sha": "99f2183288f6fe888f0662224df4fca1909a489a"
+        "sha": "e917ac5dc6b29c3e637d30f868351bc37ccbe84f"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "2414b817065726eae0bc525346c7e874f969369d"
+        "sha": "79ab0b44a2cc7d803d07c107f9faf07729fc4012"
       }
     }
   ]

README.md

@@ -177,7 +177,6 @@ has instructions for running the samples.
 | Vision Object Detection Predict | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/example/automl/VisionObjectDetectionPredict.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/automl/VisionObjectDetectionPredict.java) |
 | Dataset Api | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/translate/automl/DatasetApi.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/translate/automl/DatasetApi.java) |
 | Model Api | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/translate/automl/ModelApi.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/translate/automl/ModelApi.java) |
-| Prediction Api | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/translate/automl/PredictionApi.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/translate/automl/PredictionApi.java) |
 | Classification Deploy Model | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/vision/ClassificationDeployModel.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/vision/ClassificationDeployModel.java) |
 | Classification Undeploy Model | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/vision/ClassificationUndeployModel.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/vision/ClassificationUndeployModel.java) |
 | Model Api | [source code](https://github.com/googleapis/java-automl/blob/master/samples/snippets/src/main/java/com/google/cloud/vision/ModelApi.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-automl&page=editor&open_in_editor=samples/snippets/src/main/java/com/google/cloud/vision/ModelApi.java) |