Update bundler + dependencies

Author: kanwei

Gemfile.lock

@@ -1,28 +1,28 @@
 PATH
   remote: .
   specs:
-    algorithms (1.0.0)
+    algorithms (1.0.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.5.0)
-    rake (13.1.0)
-    rake-compiler (1.2.5)
+    diff-lcs (1.6.1)
+    rake (13.2.1)
+    rake-compiler (1.3.0)
       rake
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.2)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.3)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.3)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.3)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.6)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.1)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.2)
 
 PLATFORMS
   ruby
@@ -34,4 +34,4 @@ DEPENDENCIES
   rspec
 
 BUNDLED WITH
-   2.2.32
+   2.6.2