chore: regenerate README (#515)

This PR was generated using Autosynth. 🌈


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

```
2021-04-29 15:43:30,762 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-logging/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-29 15:43:32,181 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/7b57ebbe-ef71-47eb-b80e-e4f46d44b62b/targets

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

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-logging.git",
-        "sha": "7a57aa5957be2928a5e948b0972d7ccf028635ed"
+        "sha": "397a7a19927c735485ff7f1d314057d53fe5957a"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "ff6b759fcb58f216f62b48d5be0bb85fafbc3bb2"
+        "sha": "06a8cd0ff7e81b05e6c503eab510ec622384caa7"
       }
     }
   ]

README.md

@@ -17,7 +17,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>20.1.0</version>
+      <version>20.2.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
@@ -46,18 +46,18 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle 5.x or later, add this to your dependencies
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:20.1.0')
+implementation platform('com.google.cloud:libraries-bom:20.2.0')
 
 compile 'com.google.cloud:google-cloud-logging'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-logging:2.2.1'
+compile 'com.google.cloud:google-cloud-logging:2.2.2'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-logging" % "2.2.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-logging" % "2.2.2"
 ```
 
 ## Authentication