chore: regenerate README (#493)

This PR was generated using Autosynth. 🌈


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

```
2021-08-12 17:41:03,379 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-tasks/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-12 17:41:04,962 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/90db89b5-7bb6-4c2e-b466-a1b2794a2acd/targets

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Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-tasks.git",
-        "sha": "c70c19a3154fb815234c9b8a49a6c434901d5bfe"
+        "sha": "ff0640b7bae7ee46ebfd6f20226413875b08362b"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "3d32990b6f4b57be77455e3ca89e6e21cd0c06b3"
+        "sha": "ff01716e16d2c6e87eaf87197b753ac9fcbbed5d"
       }
     }
   ]

README.md

@@ -19,20 +19,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-tasks</artifactId>
-  <version>1.33.2</version>
+  <version>2.0.0</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-tasks:1.33.2'
+compile 'com.google.cloud:google-cloud-tasks:2.0.0'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-tasks" % "1.33.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-tasks" % "2.0.0"
 ```
 
 ## Authentication