Update sonatype snapshot repository references. (#153)

Author: Ryan Lubke

.mvn/settings.xml

@@ -24,7 +24,7 @@
         </repository>
         <repository>
           <id>sonatype-snapshots</id>
-          <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+          <url>https://central.sonatype.com/repository/maven-snapshots</url>
           <releases>
             <enabled>false</enabled>
           </releases>
@@ -46,7 +46,7 @@
         </pluginRepository>
         <pluginRepository>
           <id>sonatype-snapshots</id>
-          <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+          <url>https://central.sonatype.com/repository/maven-snapshots</url>
           <releases>
             <enabled>false</enabled>
           </releases>