add librpm-5.4.so to rpm.rb

lib/plugins/rpm.rb

@@ -6,7 +6,7 @@ module RPM
     extend ::FFI::Library
 
     begin
-      ffi_lib ['librpm.so.3', 'librpm.so.2', 'librpm.so.1', 'rpm']
+      ffi_lib ['librpm.so.3', 'librpm.so.2', 'librpm.so.1', 'librpm-5.4.so', 'rpm']
     rescue LoadError => e
       raise(
         "Can't find rpm libs on your system: #{e.message}"
@@ -16,4 +16,4 @@ module RPM
     attach_function 'rpmvercmp', [:string, :string], :int
 
   end
-end
+end