Gemfile.lock in debug_helper-2.0.0 vs Gemfile.lock in debug_helper-2.1.0

@@ -1,21 +1,23 @@
 PATH
   remote: .
   specs:
-    debug_helper (2.0.0)
+    debug_helper (2.1.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
+    diff-lcs (1.3)
     minitest (5.11.3)
     rake (10.5.0)
 
 PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
   bundler (~> 1.16)
   debug_helper!
+  diff-lcs (~> 1.3)
   minitest (~> 5.0)
   rake (~> 10.0)
 
 BUNDLED WITH
    1.16.2