add back gemfile.lock

Gemfile.lock

@@ -28,16 +28,16 @@ GEM
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
-    jekyll (3.5.1)
+    jekyll (3.6.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
+      kramdown (~> 1.14)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (~> 1.7)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
     jekyll-compose (0.9.0)
       jekyll (~> 3.0)
@@ -78,7 +78,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.6)
-    rouge (1.11.1)
+    rouge (2.2.1)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -94,9 +94,9 @@ PLATFORMS
 
 DEPENDENCIES
   html-proofer
-  jekyll (= 3.5.1)
+  jekyll (>= 3.5.1, < 3.7)
   jekyll-compose
-  jekyll-feed (~> 0.6)
+  jekyll-feed (>= 0.10)
   jekyll-git_metadata
   jekyll-scholar
   tzinfo-data