chore: regenerate README (#376)

This PR was generated using Autosynth. 🌈


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

```
2021-04-09 18:56:28,879 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-accessapproval/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-09 18:56:30,225 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/091f130d-0f33-47a3-88cc-8c00c5ecf32f/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-accessapproval.git",
-        "sha": "f5989510cd455a7e4ea2e16e7f07e983be0e6201"
+        "sha": "82680ae2a7f29c5391b762882e7ca33e7662c5ba"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "60fc32cc950c20cfdd774b846a4a7dc5d1e4d0ef"
+        "sha": "1f5e6bc8dc8e3661ee550905fc070e55e1b6cea1"
       }
     }
   ]

README.md

@@ -8,6 +8,9 @@ Java idiomatic client for [Access Approval][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
+
+
+
 ## Quickstart
 
 If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file