chore: regenerate README (#631)

This PR was generated using Autosynth. 🌈


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

```
2020-11-23 18:52:46,348 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-23 18:52:47,263 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/34a3c050-e505-4f3b-8f11-b41d95498164/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-storage.git",
-        "sha": "48e404fedd5450a63b8ea25017acfaac4c6d5849"
+        "sha": "edd955d00d6051d9d7d97b3326681cb5af80354a"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d5fc0bcf9ea9789c5b0e3154a9e3b29e5cea6116"
+        "sha": "943bb78606d035001123030067dffcc34f4645f2"
       }
     }
   ]

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>15.1.0</version>
+      <version>16.1.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
@@ -45,11 +45,11 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-storage:1.113.3'
+compile 'com.google.cloud:google-cloud-storage:1.113.4'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-storage" % "1.113.3"
+libraryDependencies += "com.google.cloud" % "google-cloud-storage" % "1.113.4"
 ```
 
 ## Authentication