chore: regenerate README (#525)

This PR was generated using Autosynth. 🌈


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

```
2021-08-31 20:56:55,738 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-compute/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-31 20:56:56,719 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/353adaa8-1403-46ba-99b0-23258817010b/targets

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Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-compute.git",
-        "sha": "d40af357fe7b8d9d753be4c9a998dc5fe69b76a8"
+        "sha": "24066f51c51ce4634880f0db7b3291dbc2ab07cf"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "8032ab5a32471d85ece8fc261df16cc40fbfa4fb"
+        "sha": "9a238a0623879c3de129a376c6085d4a862f6eb9"
       }
     }
   ]

README.md

@@ -30,7 +30,7 @@ If you are using Maven, add this to your pom.xml file:
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-compute:1.4.1-alpha'
+implementation 'com.google.cloud:google-cloud-compute:1.4.1-alpha'
 ```
 
 If you are using SBT, add this to your dependencies