Prepare for 3.0.0.Beta3 Release (#1914)

* Prepare for 3.0.0.Beta3 release

Author: hyperxpro

README.md

@@ -20,15 +20,15 @@ Maven:
     <dependency>
         <groupId>org.asynchttpclient</groupId>
         <artifactId>async-http-client</artifactId>
-        <version>3.0.0.Beta2</version>
+        <version>3.0.0.Beta3</version>
     </dependency>
 </dependencies>
 ```
 
 Gradle:
 ```groovy
 dependencies {
-    implementation 'org.asynchttpclient:async-http-client:3.0.0.Beta2'
+    implementation 'org.asynchttpclient:async-http-client:3.0.0.Beta3'
 }
 ```
 

client/pom.xml

@@ -19,7 +19,7 @@
     <parent>
         <groupId>org.asynchttpclient</groupId>
         <artifactId>async-http-client-project</artifactId>
-        <version>3.0.0.Beta2</version>
+        <version>3.0.0.Beta3</version>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>

pom.xml

@@ -20,7 +20,7 @@
 
     <groupId>org.asynchttpclient</groupId>
     <artifactId>async-http-client-project</artifactId>
-    <version>3.0.0.Beta2</version>
+    <version>3.0.0.Beta3</version>
     <packaging>pom</packaging>
 
     <name>AHC/Project</name>
@@ -316,7 +316,7 @@
             <plugin>
                 <groupId>org.sonatype.plugins</groupId>
                 <artifactId>nexus-staging-maven-plugin</artifactId>
-                <version>1.6.8</version>
+                <version>1.6.13</version>
                 <extensions>true</extensions>
                 <configuration>
                     <serverId>ossrh</serverId>