upgrade ruby and include thor in general

.ruby-version

@@ -1 +1 @@
-2.3.7
+2.3.8

Gemfile

@@ -2,6 +2,8 @@ source "https://rubygems.org"
 
 gem "rubyx" , :path => "."
 
+gem "thor"
+
 gem "rake"
 gem "rye"
 
@@ -19,7 +21,6 @@ group :test do
 end
 
 group :development do
-  gem "thor" , "0.19.1"
   gem 'guard' # NOTE: this is necessary in newer versions
   gem 'guard-minitest'
   gem "rb-readline"

Gemfile.lock

@@ -88,7 +88,7 @@ GEM
     sysinfo (0.8.1)
       drydock
       storable
-    thor (0.19.1)
+    thor (0.20.3)
 
 PLATFORMS
   ruby
@@ -109,7 +109,7 @@ DEPENDENCIES
   rx-file!
   rye
   simplecov
-  thor (= 0.19.1)
+  thor
 
 BUNDLED WITH
-   1.16.1
+   2.0.1