Maven compiler plugin (wireapp#49)

* dropped slf4j-log4j12

* Logger fix

Author: dkovacevic

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.wire</groupId>
     <artifactId>lithium</artifactId>
-    <version>3.0.0</version>
+    <version>3.0.1</version>
     <packaging>jar</packaging>
 
     <properties>
@@ -120,7 +120,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <release>14</release>
+                    <source>1.8</source>
+                    <target>1.8</target>
                 </configuration>
             </plugin>
             <plugin>

src/main/java/com/wire/lithium/Server.java

@@ -266,7 +266,7 @@ private void runHealthChecks() {
         for (String name : results.keySet()) {
             final HealthCheck.Result result = results.get(name);
             if (!result.isHealthy()) {
-                Logger.error("% failed with: %s", name, result.getMessage());
+                Logger.error("%s failed with: %s", name, result.getMessage());
                 throw new RuntimeException(result.getError());
             }
         }