chore: regenerate README (#19)

This PR was generated using Autosynth. 🌈


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

```
2021-04-20 16:02:21,400 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-api-gateway/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-20 16:02:22,696 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/75abb113-1af7-4dc1-b849-b13df90069e4/targets

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Author: yoshi-automation

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

@@ -0,0 +1,18 @@
+{
+  "sources": [
+    {
+      "git": {
+        "name": ".",
+        "remote": "https://github.com/googleapis/java-api-gateway.git",
+        "sha": "9c64584e14a8e4b9d4819e457bb6a3e07f66c5ed"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "ff6b759fcb58f216f62b48d5be0bb85fafbc3bb2"
+      }
+    }
+  ]
+}

README.md

@@ -17,18 +17,18 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-api-gateway</artifactId>
-  <version>0.0.0</version>
+  <version>0.1.0</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-api-gateway:0.0.0'
+compile 'com.google.cloud:google-cloud-api-gateway:0.1.0'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-api-gateway" % "0.0.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-api-gateway" % "0.1.0"
 ```
 
 ## Authentication