update gem file.

Gemfile.lock

@@ -37,7 +37,7 @@ GEM
       thread_safe (~> 0.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
       tzinfo (~> 1.1)
     ansi (1.4.3)
     ansi (1.4.3)
-    arel (6.0.0)
+    arel (6.0.0.beta2)
     bcrypt (3.1.7)
     bcrypt (3.1.7)
     bcrypt (3.1.7-x64-mingw32)
     bcrypt (3.1.7-x64-mingw32)
     binding_of_caller (0.7.3.pre1)
     binding_of_caller (0.7.3.pre1)
@@ -125,7 +125,7 @@ GEM
     formatador (0.2.5)
     formatador (0.2.5)
     globalid (0.3.0)
     globalid (0.3.0)
       activesupport (>= 4.1.0)
       activesupport (>= 4.1.0)
-    guard (2.8.2)
+    guard (2.9.0)
       formatador (>= 0.2.4)
       formatador (>= 0.2.4)
       listen (~> 2.7)
       listen (~> 2.7)
       lumberjack (~> 1.0)
       lumberjack (~> 1.0)
@@ -306,6 +306,7 @@ PLATFORMS
   x64-mingw32
   x64-mingw32
 
 
 DEPENDENCIES
 DEPENDENCIES
+  arel (= 6.0.0.beta2)
   bcrypt (= 3.1.7)
   bcrypt (= 3.1.7)
   bootstrap-sass (= 3.2.0.0)
   bootstrap-sass (= 3.2.0.0)
   byebug (= 3.4.0)
   byebug (= 3.4.0)