Gemfile.lock in heartcheck-1.0.7 vs Gemfile.lock in heartcheck-1.0.8

@@ -1,19 +1,20 @@
 PATH
   remote: .
   specs:
-    heartcheck (1.0.7)
+    heartcheck (1.0.8)
       oj
       rack (~> 1, >= 1.4.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.0.0)
     astrolabe (1.3.1)
       parser (~> 2.2)
     coderay (1.1.0)
+    concurrent-ruby (0.9.1)
     diff-lcs (1.2.5)
     method_source (0.8.2)
     oj (2.12.10)
     parser (2.2.2.6)
       ast (>= 1.1, < 3.0)
@@ -53,9 +54,10 @@
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  concurrent-ruby (~> 0.9.1, >= 0.9.1)
   heartcheck!
   pry-nav (~> 0.2.0, >= 0.2.4)
   rack-test (~> 0.6.0, >= 0.6.3)
   rspec (~> 3.1.0, >= 3.1.0)
   rubocop (~> 0.27.0, >= 0.27.1)