updated README with new NER usage

Author: andrewmcloud

README.md

@@ -27,16 +27,18 @@ to get its tag. For more information, see the [relevant Javadoc](http://nlp.stan
 To tag named entities utilizing standard Stanford NER model:
 
     (use 'corenlp)
+    (def pipeline (initialize-pipeline))
     (def text "The United States of America will be tagged as a location")
-    (tag-ner text)
+    (tag-ner pipeline text)
 
 Training your own model [How to Train Your Own Model](https://nlp.stanford.edu/software/crf-faq.html#a)
 
 To tag named entities utilizing custom trained model: 
 
     (use 'corenlp)
+    (def pipeline (initialize-pipeline "path-to-serialized-model"))
     (def text "The United States of America will be tagged as a location")
-    (tag-ner text path-to-serialized-model)
+    (tag-ner pipeline text)
 
 Utilizing either NER tagging strategy, a map containing the original text, sentences, tokens, and ner tags will be returned.