Gemfile.lock in juandpineiro_palindrome-0.2.1 vs Gemfile.lock in juandpineiro_palindrome-0.2.2

@@ -1,22 +1,36 @@
 PATH
   remote: .
   specs:
-    juandpineiro_palindrome (0.2.1)
+    juandpineiro_palindrome (0.2.2)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ansi (1.5.0)
     builder (3.2.4)
+    diff-lcs (1.3)
     minitest (5.13.0)
     minitest-reporters (1.2.0)
       ansi
       builder
       minitest (>= 5.0)
       ruby-progressbar
     rake (10.5.0)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.0)
+      rspec-support (~> 3.9.0)
+    rspec-expectations (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.0)
     ruby-progressbar (1.10.1)
 
 PLATFORMS
   ruby
 
@@ -24,8 +38,9 @@
   bundler (~> 2.0)
   juandpineiro_palindrome!
   minitest (~> 5.0)
   minitest-reporters (= 1.2.0)
   rake (~> 10.0)
+  rspec
 
 BUNDLED WITH
    2.0.2