pom.xml: Add 'slf4j-nop' dependency

Quiet the following warning output that appeared when running the
executable:

    $ java -jar target/pdf-form-replace-font2-0.0.1-SNAPSHOT.jar --find HelveticaLTStd-Bold --replace CourierNewPSMT --output f1040-courier.pdf f1040.pdf
    SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
    SLF4J: Defaulting to no-operation (NOP) logger implementation
    SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

1 files changed, 6 insertions, 0 deletions

diff --git a/pom.xml b/pom.xml
index 847468b..6fd2a37 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,6 +55,12 @@ along with PDF Form Replace Font2. If not, see
       <version>1.5.0</version>
       <scope>compile</scope>
     </dependency>
+
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-nop</artifactId>
+      <version>2.0.7</version>
+    </dependency>
   </dependencies>
 
   <build>