fix: Gemfile & Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-REDCARPET-20212

Latest report for bangaloreruby/bangaloreruby.github.com:
https://snyk.io/test/github/bangaloreruby/bangaloreruby.github.com

Gemfile

@@ -1,3 +1,3 @@
 source "http://rubygems.org"
-gem 'jekyll', "~> 1.3.0"
+gem 'jekyll', '~> 2.0.0' # This change was made via Snyk to fix a vulnerability
 

Gemfile.lock

@@ -1,47 +1,68 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    classifier (1.3.3)
+    blankslate (2.1.2.4)
+    celluloid (0.16.0)
+      timers (~> 4.0.0)
+    classifier (1.3.4)
       fast-stemmer (>= 1.0.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.11.1)
     colorator (0.1)
-    commander (4.1.5)
-      highline (~> 1.6.11)
+    execjs (2.7.0)
     fast-stemmer (1.0.2)
-    ffi (1.9.3)
-    highline (1.6.20)
-    jekyll (1.3.0)
+    ffi (1.9.17)
+    hitimes (1.2.4)
+    jekyll (2.0.3)
       classifier (~> 1.3)
       colorator (~> 0.1)
-      commander (~> 4.1.3)
-      liquid (~> 2.5.2)
-      listen (~> 1.3)
-      maruku (~> 0.6.0)
+      jekyll-coffeescript (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      kramdown (~> 1.3)
+      liquid (~> 2.5.5)
+      listen (~> 2.5)
+      mercenary (~> 0.3.3)
       pygments.rb (~> 0.5.0)
-      redcarpet (~> 2.3.0)
-      safe_yaml (~> 0.9.7)
-    liquid (2.5.4)
-    listen (1.3.1)
+      redcarpet (~> 3.1)
+      safe_yaml (~> 1.0)
+      toml (~> 0.1.0)
+    jekyll-coffeescript (1.0.2)
+      coffee-script (~> 2.2)
+      coffee-script-source (~> 1.11.1)
+    jekyll-sass-converter (1.5.0)
+      sass (~> 3.4)
+    kramdown (1.13.2)
+    liquid (2.5.5)
+    listen (2.10.1)
+      celluloid (~> 0.16.0)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
-      rb-kqueue (>= 0.2)
-    maruku (0.6.1)
-      syntax (>= 1.0.0)
-    posix-spawn (0.3.6)
+    mercenary (0.3.6)
+    parslet (1.5.0)
+      blankslate (~> 2.0)
+    posix-spawn (0.3.13)
     pygments.rb (0.5.4)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rb-fsevent (0.9.3)
-    rb-inotify (0.9.2)
+    rb-fsevent (0.9.8)
+    rb-inotify (0.9.8)
       ffi (>= 0.5.0)
-    rb-kqueue (0.2.0)
-      ffi (>= 0.5.0)
-    redcarpet (2.3.0)
-    safe_yaml (0.9.7)
-    syntax (1.0.0)
+    redcarpet (3.4.0)
+    safe_yaml (1.0.4)
+    sass (3.4.23)
+    timers (4.0.4)
+      hitimes
+    toml (0.1.2)
+      parslet (~> 1.5.0)
     yajl-ruby (1.1.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 1.3.0)
+  jekyll (~> 2.0.0)
+
+BUNDLED WITH
+   1.13.6