Remove singleton (#273)

Author: dr0i

metafix/src/main/java/org/metafacture/metafix/FixMethod.java

@@ -667,12 +667,13 @@ public void apply(final Metafix metafix, final Record record, final List<String>
     uri_encode {
         @Override
         public void apply(final Metafix metafix, final Record record, final List<String> params, final Map<String, String> options) {
-            URL_ENCODER.setPlusForSpace(false);
-            record.transform(params.get(0), URL_ENCODER::process);
+            final URLEncode urlEncoder = new URLEncode();
+            urlEncoder.setPlusForSpace(false);
+
+            record.transform(params.get(0), urlEncoder::process);
         }
     };
 
-    private static final URLEncode URL_ENCODER = new URLEncode();
     private static final Pattern NAMED_GROUP_PATTERN = Pattern.compile("\\(\\?<(.+?)>");
 
     private static final String FILEMAP_SEPARATOR_OPTION = "sep_char";