chore: regenerate README (#294)

This PR was generated using Autosynth. 🌈


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

```
2020-11-02 21:36:43,577 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-tasks/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-02 21:36:44,533 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/9aff5282-6815-476f-9bf5-bf710e3a9bd5/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-tasks.git",
-        "sha": "2f5afe00e9ee146534071d979f9baaa523807434"
+        "sha": "bb37052502c1ababaf5f6d4661ddb1bb254e559b"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "b19b401571e77192f8dd38eab5fb2300a0de9324"
+        "sha": "ba9918cd22874245b55734f57470c719b577e591"
       }
     }
   ]

README.md

@@ -10,37 +10,15 @@ Java idiomatic client for [Cloud Tasks][product-docs].
 
 ## Quickstart
 
-If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
-```xml
-<dependencyManagement>
-  <dependencies>
-    <dependency>
-      <groupId>com.google.cloud</groupId>
-      <artifactId>libraries-bom</artifactId>
-      <version>13.4.0</version>
-      <type>pom</type>
-      <scope>import</scope>
-    </dependency>
-  </dependencies>
-</dependencyManagement>
-
-<dependencies>
-  <dependency>
-    <groupId>com.google.cloud</groupId>
-    <artifactId>google-cloud-tasks</artifactId>
-  </dependency>
-
-```
 
-If you are using Maven without BOM, add this to your dependencies:
+If you are using Maven, add this to your pom.xml file:
 
 ```xml
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-tasks</artifactId>
   <version>1.30.7</version>
 </dependency>
-
 ```
 
 If you are using Gradle, add this to your dependencies