update ruby version for openssl 1.1.0 compatibility

Author: stvnrlly

.ruby-version

@@ -1 +1 @@
-2.3.1
+2.4.3

Gemfile.lock

@@ -63,12 +63,12 @@ GEM
     html-pipeline (2.7.1)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.7.5)
+    html-proofer (3.7.6)
       activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
       colorize (~> 0.8)
       mercenary (~> 0.3.2)
-      nokogiri (~> 1.7)
+      nokogiri (~> 1.8.1)
       parallel (~> 1.3)
       typhoeus (~> 0.7)
       yell (~> 2.0)
@@ -138,14 +138,14 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.3.0)
     minima (2.0.0)
-    minitest (5.10.3)
+    minitest (5.11.1)
     multipart-post (2.0.0)
     net-dns (0.8.0)
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
-    octokit (4.7.0)
+    octokit (4.8.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.12.0)
+    parallel (1.12.1)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.5)
@@ -154,7 +154,7 @@ GEM
       ffi (>= 0.5.0, < 2)
     rouge (1.11.1)
     safe_yaml (1.0.4)
-    sass (3.5.3)
+    sass (3.5.5)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)