.gitignore in fhir_models-3.0.4 vs .gitignore in fhir_models-4.0.0

@@ -1,8 +1,10 @@
 .DS_Store
 **/coverage/**
 fhir_models*log*
 invariants.txt
-Gemfile.lock
 .ruby-version
 .ruby-gemset
 tmp/
+
+# User-specific
+.idea