chore: bump versions in README (googleapis#134)

* Change triggered by none of the following:
This git repo (https://github.com/googleapis/java-dataproc.git)
Git repo https://github.com/googleapis/googleapis.git
Git repo https://github.com/googleapis/synthtool.git

* chore(deps): update dependency com.google.cloud:libraries-bom to v4.4.1 (googleapis#126)

googleapis@799beb5
commit 799beb5
Author: WhiteSource Renovate <bot@renovateapp.com>
Date:   Mon Apr 6 19:58:32 2020 +0200

    chore(deps): update dependency com.google.cloud:libraries-bom to v4.4.1 (googleapis#126)

    This PR contains the following updates:

    | Package | Update | Change |
    |---|---|---|
    | [com.google.cloud:libraries-bom](https://togithub.com/GoogleCloudPlatform/cloud-opensource-java) | patch | `4.4.0` -> `4.4.1` |

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README.md

@@ -20,7 +20,7 @@ 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>4.4.0</version>
+      <version>4.4.1</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
@@ -43,18 +43,18 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-dataproc</artifactId>
-  <version>0.120.0</version>
+  <version>0.121.0</version>
 </dependency>
 
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-dataproc:0.120.0'
+compile 'com.google.cloud:google-cloud-dataproc:0.121.0'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-dataproc" % "0.120.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-dataproc" % "0.121.0"
 ```
 [//]: # ({x-version-update-end})
 

synth.metadata

@@ -1,6 +1,13 @@
 {
-  "updateTime": "2020-04-01T22:31:03.943614Z",
+  "updateTime": "2020-04-08T23:43:44.331357Z",
   "sources": [
+    {
+      "git": {
+        "name": ".",
+        "remote": "https://github.com/googleapis/java-dataproc.git",
+        "sha": "799beb5e127ecf54b93e77bd92c99642a0d450db"
+      }
+    },
     {
       "git": {
         "name": "googleapis",