chore: regenerate README (#161)

This PR was generated using Autosynth. 🌈


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

```
2021-02-26 00:28:33,875 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-analytics-data/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-26 00:28:35,481 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/9f4d8bd9-8c04-40cc-95f5-cebae219703b/targets

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

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-analytics-data.git",
-        "sha": "dd37ff2c80f5d9df4a1ab06731a9b8c8fd308e65"
+        "sha": "009ac70ab39adf5b0edad5fe80799dc5a51eb7f8"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "27b2d4f4674840628d0b75c5941e89c12af4764f"
+        "sha": "8c5628b86cfa8386de7b8fc1675e6b528b552d57"
       }
     }
   ]

README.md

@@ -20,18 +20,18 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.analytics</groupId>
   <artifactId>google-analytics-data</artifactId>
-  <version>0.5.4</version>
+  <version>0.5.5</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.analytics:google-analytics-data:0.5.4'
+compile 'com.google.analytics:google-analytics-data:0.5.5'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.analytics" % "google-analytics-data" % "0.5.4"
+libraryDependencies += "com.google.analytics" % "google-analytics-data" % "0.5.5"
 ```
 
 ## Authentication