Prevent multiple SLF4J bindings warning. (#649)

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:.../metafacture-runner/lib/slf4j-simple-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:.../metafacture-runner/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]

Author: blackwinter

metafacture-runner/build.gradle

@@ -73,7 +73,10 @@ dependencies {
   // class loader which was used to load the classes of the slf4j-api. Until
   // a solution is found for this problem, the binding need to be placed on the
   // class path:
-  runtimeOnly "org.slf4j:slf4j-log4j12:${versions.slf4j}"
+  runtimeOnly("org.slf4j:slf4j-log4j12:${versions.slf4j}") {
+    // Prevent multiple SLF4J bindings warning:
+    exclude group: 'org.slf4j', module: 'slf4j-reload4j'
+  }
 
   // The following dependencies are placed in the "provided" scope to prevent
   // them from being included in the class path but still have them available