Update per security warning

Gemfile.lock

@@ -1,59 +1,63 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    capybara (2.5.0)
-      mime-types (>= 1.16)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    capybara (2.17.0)
+      addressable
+      mini_mime (>= 0.1.3)
       nokogiri (>= 1.3.3)
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
-      xpath (~> 2.0)
-    coderay (1.1.0)
-    daemons (1.2.3)
-    diff-lcs (1.2.5)
-    eventmachine (1.0.8)
-    method_source (0.8.2)
-    mime-types (2.6.2)
-    mini_portile (0.6.2)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
-    pry (0.10.3)
+      xpath (>= 2.0, < 4.0)
+    coderay (1.1.2)
+    daemons (1.2.6)
+    diff-lcs (1.3)
+    eventmachine (1.2.5)
+    method_source (0.9.0)
+    mini_mime (1.0.0)
+    mini_portile2 (2.3.0)
+    mustermann (1.0.1)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
+    pry (0.11.3)
       coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    rack (1.6.4)
-    rack-protection (1.5.3)
+      method_source (~> 0.9.0)
+    public_suffix (3.0.1)
+    rack (2.0.3)
+    rack-protection (2.0.0)
       rack
-    rack-test (0.6.3)
-      rack (>= 1.0)
-    rake (10.4.2)
-    require_all (1.3.2)
-    rspec (3.3.0)
-      rspec-core (~> 3.3.0)
-      rspec-expectations (~> 3.3.0)
-      rspec-mocks (~> 3.3.0)
-    rspec-core (3.3.2)
-      rspec-support (~> 3.3.0)
-    rspec-expectations (3.3.1)
+    rack-test (0.8.2)
+      rack (>= 1.0, < 3)
+    rake (12.3.0)
+    require_all (1.5.0)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.3.0)
-    rspec-mocks (3.3.2)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.3.0)
-    rspec-support (3.3.0)
-    shotgun (0.9.1)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.0)
+    shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (1.4.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    slop (3.6.0)
-    thin (1.6.4)
+    sinatra (2.0.0)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.0)
+      tilt (~> 2.0)
+    thin (1.7.2)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
-      rack (~> 1.0)
-    tilt (2.0.1)
-    xpath (2.0.0)
-      nokogiri (~> 1.3)
+      rack (>= 1, < 3)
+    tilt (2.0.8)
+    xpath (3.0.0)
+      nokogiri (~> 1.8)
 
 PLATFORMS
   ruby
@@ -70,4 +74,4 @@ DEPENDENCIES
   thin
 
 BUNDLED WITH
-   1.10.6
+   1.16.0