chore: regenerate README (#210)

This PR was generated using Autosynth. 🌈


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

```
2020-10-22 08:12:18,167 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-logging-logback/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-22 08:12:19,093 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/f8b7d74f-7d9b-4121-85a9-073880dc029d/targets

- [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-logging-logback.git",
-        "sha": "838ae88019b18b52f410cf1f6334cc58b8ffb6c9"
+        "sha": "463c6d1bf94ee2215d7030e8965143cef2bcd550"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d5d03413e1879108b5ade8839ce38de01be652da"
+        "sha": "901ddd44e9ef7887ee681b9183bbdea99437fdcc"
       }
     }
   ]

README.md

@@ -20,17 +20,17 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-logging-logback</artifactId>
-  <version>0.118.2-alpha</version>
+  <version>0.118.3-alpha</version>
 </dependency>
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-logging-logback:0.118.2-alpha'
+compile 'com.google.cloud:google-cloud-logging-logback:0.118.3-alpha'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-logging-logback" % "0.118.2-alpha"
+libraryDependencies += "com.google.cloud" % "google-cloud-logging-logback" % "0.118.3-alpha"
 ```
 
 ## Authentication