Updating gemfile

Signed-off-by: Mary Anthony <mary@blockstack.com>

Gemfile.lock

@@ -1,20 +1,20 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
+    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 4.0)
+      public_suffix (>= 2.0.2, < 5.0)
     coderay (1.1.2)
     colorator (1.1.0)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    faraday (0.15.3)
+    faraday (0.17.1)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.25)
+    ffi (1.11.3)
     formatador (0.2.5)
     forwardable-extended (2.6.0)
-    guard (2.14.2)
+    guard (2.16.1)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       lumberjack (>= 1.0.12, < 2.0)
@@ -35,73 +35,71 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
-    jekyll-avatar (0.6.0)
+    jekyll-avatar (0.7.0)
-      jekyll (~> 3.0)
+      jekyll (>= 3.0, < 5.0)
     jekyll-feed (0.11.0)
       jekyll (~> 3.3)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
-    jekyll-google-tag-manager (1.0.1)
+    jekyll-google-tag-manager (1.0.3)
-      jekyll (~> 3.3)
+      jekyll (>= 3.3, < 5.0)
     jekyll-livereload (0.2.2)
       em-websocket (~> 0.5)
       jekyll (~> 3.0)
     jekyll-paginate (1.1.0)
-    jekyll-redirect-from (0.12.1)
+    jekyll-redirect-from (0.15.0)
-      jekyll (~> 3.3)
+      jekyll (>= 3.3, < 5.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-seo-tag (2.5.0)
+    jekyll-seo-tag (2.6.1)
-      jekyll (~> 3.3)
+      jekyll (>= 3.3, < 5.0)
     jekyll-sitemap (1.2.0)
       jekyll (~> 3.3)
-    jekyll-titles-from-headings (0.5.1)
+    jekyll-titles-from-headings (0.5.3)
-      jekyll (~> 3.3)
+      jekyll (>= 3.3, < 5.0)
-    jekyll-toc (0.11.0)
+    jekyll-toc (0.12.2)
       nokogiri (~> 1.9)
     jekyll-watch (1.5.1)
       listen (~> 3.0)
     kramdown (1.17.0)
-    liquid (4.0.1)
+    liquid (4.0.3)
-    listen (3.1.5)
+    listen (3.2.1)
-      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.7)
+      rb-inotify (~> 0.9, >= 0.9.10)
-      ruby_dep (~> 1.2)
     lumberjack (1.0.13)
     mercenary (0.3.6)
-    method_source (0.9.0)
+    method_source (0.9.2)
     mini_portile2 (2.4.0)
-    multipart-post (2.0.0)
+    multipart-post (2.1.1)
     nenv (0.3.0)
-    nokogiri (1.10.2)
+    nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
-    notiffany (0.1.1)
+    notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    octokit (4.13.0)
+    octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    pathutil (0.16.1)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    pry (0.11.3)
+    pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.1)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
+    rb-inotify (0.10.0)
-      ffi (>= 0.5.0, < 2)
+      ffi (~> 1.0)
     rouge (2.2.1)
-    ruby_dep (1.5.0)
+    safe_yaml (1.0.5)
-    safe_yaml (1.0.4)
+    sass (3.7.4)
-    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sawyer (0.8.1)
+    sawyer (0.8.2)
-      addressable (>= 2.3.5, < 2.6)
+      addressable (>= 2.3.5)
-      faraday (~> 0.8, < 1.0)
+      faraday (> 0.8, < 2.0)
     shellany (0.0.1)
-    thor (0.20.0)
+    thor (0.20.3)
 
 PLATFORMS
   ruby