Merge pull request #9 from bcbi/versionupdate

updated readme

README.md

@@ -55,6 +55,7 @@ Your CSV file should look like the following:
 1. **Include the module and use it in your script or Julia REPL:**
 
     ```julia
+    using Pkg
     Pkg.add("OMOPVocabMapper")
     using OMOPVocabMapper
     ```