Bump ruby and lib versions

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.3.1'
+ruby '2.3.5'
 
 gem 'sinatra'
 gem 'activerecord'

Gemfile.lock

@@ -1,59 +1,62 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (5.0.0.1)
-      activesupport (= 5.0.0.1)
-    activerecord (5.0.0.1)
-      activemodel (= 5.0.0.1)
-      activesupport (= 5.0.0.1)
-      arel (~> 7.0)
-    activesupport (5.0.0.1)
+    activemodel (5.1.4)
+      activesupport (= 5.1.4)
+    activerecord (5.1.4)
+      activemodel (= 5.1.4)
+      activesupport (= 5.1.4)
+      arel (~> 8.0)
+    activesupport (5.1.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    arel (7.1.4)
-    concurrent-ruby (1.0.2)
-    database_cleaner (1.5.3)
-    diff-lcs (1.2.5)
-    i18n (0.7.0)
-    minitest (5.10.0)
-    pg (0.19.0)
-    rack (1.6.5)
-    rack-protection (1.5.3)
+    arel (8.0.0)
+    concurrent-ruby (1.0.5)
+    database_cleaner (1.6.2)
+    diff-lcs (1.3)
+    i18n (0.9.1)
+      concurrent-ruby (~> 1.0)
+    minitest (5.11.1)
+    mustermann (1.0.1)
+    pg (1.0.0)
+    rack (2.0.3)
+    rack-protection (2.0.0)
       rack
-    rack-test (0.6.3)
-      rack (>= 1.0)
-    rake (10.5.0)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.4)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
+    rack-test (0.8.2)
+      rack (>= 1.0, < 3)
+    rake (12.3.0)
+    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 (~> 3.5.0)
-    rspec-mocks (3.5.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.0)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    sinatra-activerecord (2.0.11)
+    sinatra (2.0.0)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.0)
+      tilt (~> 2.0)
+    sinatra-activerecord (2.0.13)
       activerecord (>= 3.2)
-      sinatra (~> 1.0)
-    slim (3.0.7)
-      temple (~> 0.7.6)
+      sinatra (>= 1.0)
+    slim (3.0.9)
+      temple (>= 0.7.6, < 0.9)
       tilt (>= 1.3.3, < 2.1)
-    temple (0.7.7)
-    thread_safe (0.3.5)
-    tilt (2.0.5)
-    tzinfo (1.2.2)
+    temple (0.8.0)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    tzinfo (1.2.4)
       thread_safe (~> 0.1)
 
 PLATFORMS
@@ -72,7 +75,7 @@ DEPENDENCIES
   slim
 
 RUBY VERSION
-   ruby 2.3.1p112
+   ruby 2.3.5p376
 
 BUNDLED WITH
-   1.13.6
+   1.16.1