chore: regenerate README (#194)

This PR was generated using Autosynth. 🌈


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

```
2020-10-15 22:50:48,867 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-logging-logback/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-15 22:50:49,972 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/6d76bcad-8cc4-424b-a394-027c96a16782/targets

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

Author: yoshi-automation

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

@@ -0,0 +1,18 @@
+{
+  "sources": [
+    {
+      "git": {
+        "name": ".",
+        "remote": "https://github.com/googleapis/java-logging-logback.git",
+        "sha": "838ae88019b18b52f410cf1f6334cc58b8ffb6c9"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "d5d03413e1879108b5ade8839ce38de01be652da"
+      }
+    }
+  ]
+}

README.md

@@ -24,8 +24,6 @@ If you are using Maven, add this to your pom.xml file:
 </dependency>
 ```
 
-[//]: # ({x-version-update-start:google-cloud-logging-logback:released})
-
 If you are using Gradle, add this to your dependencies
 ```Groovy
 compile 'com.google.cloud:google-cloud-logging-logback:0.118.2-alpha'
@@ -34,7 +32,6 @@ If you are using SBT, add this to your dependencies
 ```Scala
 libraryDependencies += "com.google.cloud" % "google-cloud-logging-logback" % "0.118.2-alpha"
 ```
-[//]: # ({x-version-update-end})
 
 ## Authentication