DEV: Add disable_ternary plugin to syntax tree (#28)

.streerc

@@ -1,2 +1,2 @@
 --print-width=100
---plugins=plugin/trailing_comma
+--plugins=plugin/trailing_comma,disable_ternary

Gemfile

@@ -5,4 +5,5 @@ source "https://rubygems.org"
 group :development do
   gem "rubocop-discourse"
   gem "syntax_tree"
+  gem "syntax_tree-disable_ternary"
 end

Gemfile.lock

@@ -30,6 +30,7 @@ GEM
     ruby-progressbar (1.11.0)
     syntax_tree (5.1.0)
       prettier_print (>= 1.2.0)
+    syntax_tree-disable_ternary (1.0.0)
     unicode-display_width (2.3.0)
 
 PLATFORMS
@@ -43,6 +44,7 @@ PLATFORMS
 DEPENDENCIES
   rubocop-discourse
   syntax_tree
+  syntax_tree-disable_ternary
 
 BUNDLED WITH
    2.3.10