added missing gem

schedules_api/Gemfile

@@ -65,4 +65,8 @@ gem 'rubyXL'
 # Linting
 gem "rubocop", "~> 0.58.2"
 
+# API documentation
 gem 'apipie-rails'
+
+# Markdown for API docs
+gem 'maruku'

schedules_api/Gemfile.lock

@@ -81,6 +81,7 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
+    maruku (0.7.3)
     method_source (0.9.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -207,6 +208,7 @@ DEPENDENCIES
   icalendar
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
+  maruku
   nokogiri
   pry
   pry-doc