chore: regenerate README (#134)

This PR was generated using Autosynth. 🌈


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

```
2021-01-07 22:30:05,365 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-analytics-admin/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-01-07 22:30:06,438 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/1f4be7af-0836-4af2-80d3-fceea650c775/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-analytics-admin.git",
-        "sha": "7a48532d78c0b534a63f2452934f0ca9cdda3053"
+        "sha": "15ccf20bf20791d2a0192d67302e40a46a5cf432"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "3f67ceece7e797a5736a25488aae35405649b90b"
+        "sha": "67f09bf301083798e7220137723222eb00b8f88a"
       }
     }
   ]

README.md

@@ -24,10 +24,11 @@ If you are using Maven, add this to your pom.xml file:
 </dependency>
 ```
 
-If you are using Gradle, add this to your dependencies
+If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
 compile 'com.google.analytics:google-analytics-admin:0.2.5'
 ```
+
 If you are using SBT, add this to your dependencies
 ```Scala
 libraryDependencies += "com.google.analytics" % "google-analytics-admin" % "0.2.5"