Update deployment scripts

Gemfile

@@ -22,6 +22,7 @@ group :development do
   gem 'capistrano-rails'
   gem 'capistrano-rvm'
   gem 'capistrano3-puma'
+  gem 'ed25519'
   gem 'listen'
 end
 

Gemfile.lock

@@ -99,6 +99,7 @@ GEM
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.5)
     crass (1.0.4)
+    ed25519 (1.2.4)
     erubi (1.9.0)
     execjs (2.7.0)
     ffi (1.11.1)
@@ -217,6 +218,7 @@ DEPENDENCIES
   capistrano-rvm
   capistrano3-puma
   coffee-rails
+  ed25519
   jbuilder
   jquery-rails
   listen

config/deploy.rb

@@ -1,5 +1,5 @@
 # config valid only for current version of Capistrano
-lock '3.9.1'
+lock '3.11.2'
 
 set :application, 'gauge'
 set :repo_url, 'https://github.com/OpenFest/gauge.git'
@@ -35,7 +35,7 @@ append :linked_dirs, 'log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bund
 # Default value for keep_releases is 5
 # set :keep_releases, 5
 
-set :rvm_ruby_version, '2.4.1'
+set :rvm_ruby_version, '2.6.5'
 
 set :puma_bind, ["tcp://127.0.0.1:9088"]
 set :puma_init_active_record, true