Update metrics listeners dependencies/READMEs; update to Dropwizard Metrics 4

dropwizard-metrics-listener/README.md

@@ -6,11 +6,11 @@ This module is an implementation of Pushy's [`ApnsClientMetricsListener`](https:
 <dependency>
     <groupId>com.eatthepath</groupId>
     <artifactId>pushy-dropwizard-metrics-listener</artifactId>
-    <version>0.15.2</version>
+    <version>0.16.0</version>
 </dependency>
 ```
 
-If you don't use Maven, you can add the `.jar` file and its dependencies to your classpath by the method of your choice. The Dropwizard Metrics listener for Pushy depends on Pushy itself (obviously enough) and version 3.1.0 of the [Dropwizard Metrics library](http://metrics.dropwizard.io/).
+If you don't use Maven, you can add the `.jar` file and its dependencies to your classpath by the method of your choice. The Dropwizard Metrics listener for Pushy depends on Pushy itself (obviously enough) and version 4.2.26 of the [Dropwizard Metrics library](http://metrics.dropwizard.io/).
 
 ## Using the Dropwizard Metrics listener
 

dropwizard-metrics-listener/pom.xml

@@ -44,7 +44,7 @@
         <dependency>
             <groupId>io.dropwizard.metrics</groupId>
             <artifactId>metrics-core</artifactId>
-            <version>3.1.0</version>
+            <version>4.2.26</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>

micrometer-metrics-listener/README.md

@@ -6,11 +6,11 @@ This module is an implementation of Pushy's [`ApnsClientMetricsListener`](https:
 <dependency>
     <groupId>com.eatthepath</groupId>
     <artifactId>pushy-micrometer-metrics-listener</artifactId>
-    <version>0.15.2</version>
+    <version>0.16.0</version>
 </dependency>
 ```
 
-If you don't use Maven, you can add the `.jar` file and its dependencies to your classpath by the method of your choice. The Micrometer listener for Pushy depends on Pushy itself (obviously enough) and version 1.0 of the [Micrometer application monitoring library](http://micrometer.io/). Please note that while Pushy itself works with Java 7 and newer, **the Micrometer metrics listener requires Java 8 or newer.**
+If you don't use Maven, you can add the `.jar` file and its dependencies to your classpath by the method of your choice. The Micrometer listener for Pushy depends on Pushy itself (obviously enough) and version 1.13.1 of the [Micrometer application monitoring library](http://micrometer.io/).
 
 ## Using the Micrometer Metrics listener
 

micrometer-metrics-listener/pom.xml

@@ -43,7 +43,7 @@
         <dependency>
             <groupId>io.micrometer</groupId>
             <artifactId>micrometer-core</artifactId>
-            <version>1.0.3</version>
+            <version>1.13.1</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>