[release] final pom.xml, changelog and readme update for 3.0.0 (#168)

Author: truthbk

CHANGELOG.md

@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## 3.0.0 / Unreleased
+## 3.0.0 / 2021.11.02
 
 This release marks a new major release, and includes some *breaking changes*.
 Most notably:

README.md

@@ -17,7 +17,7 @@ The client jar is distributed via Maven central, and can be downloaded [from Mav
 <dependency>
     <groupId>com.datadoghq</groupId>
     <artifactId>java-dogstatsd-client</artifactId>
-    <version>2.13.0</version>
+    <version>3.0.0</version>
 </dependency>
 ```
 

pom.xml

@@ -7,7 +7,7 @@
     <artifactId>java-dogstatsd-client</artifactId>
     <packaging>jar</packaging>
     <name>java-dogstatsd-client</name>
-    <version>2.13.0</version>
+    <version>3.0.0</version>
     <description>A tiny library allowing Java applications to communicate with DataDog statsd instances easily.</description>
     <url>https://github.com/DataDog/java-dogstatsd-client</url>