Attempted fix for latest version

Author: tvdijen

Gemfile

@@ -2,3 +2,5 @@ source 'https://rubygems.org'
 gem "jekyll"
 gem "json"
 gem "hash-joiner"
+
+gem "jekyll-get-json", "~> 1.0"

Gemfile.lock

@@ -8,6 +8,7 @@ GEM
     colorator (1.1.0)
     concurrent-ruby (1.3.6)
     csv (3.3.5)
+    deep_merge (1.2.2)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -41,6 +42,9 @@ GEM
       safe_yaml (~> 1.0)
       terminal-table (>= 1.8, < 4.0)
       webrick (~> 1.7)
+    jekyll-get-json (1.0.0)
+      deep_merge (~> 1.2)
+      jekyll (>= 3.0)
     jekyll-sass-converter (3.1.0)
       sass-embedded (~> 1.75)
     jekyll-watch (2.2.1)
@@ -81,6 +85,7 @@ PLATFORMS
 DEPENDENCIES
   hash-joiner
   jekyll
+  jekyll-get-json (~> 1.0)
   json
 
 BUNDLED WITH

_config.yml

@@ -12,7 +12,7 @@ plugins_dir: ./_plugins
 # Build settings
 markdown: kramdown
 
-jekyll_get:
+jekyll_get_json:
   - data: latest
     json: 'https://api.github.com/repos/simplesamlphp/simplesamlphp/releases/latest'
     cache: false