Update README.md

Author: butteff

README.md

@@ -14,7 +14,7 @@ An example practical aspect: it can be useful to understand will a black colored
 #### How to Install:
 
 Gemfile: 
-`gem 'is_dark', '~> 0.2.0'`
+`gem 'is_dark'
 
 Install: 
 `gem install is_dark`
@@ -70,4 +70,4 @@ You can calibrate it more deep, change constants for it inside lib/is_dark.rb fi
 
 #### Old versions:
 
-Old versions of the gem are about static methods only, you can find old documentation about it all in [README_old.md file]( https://github.com/butteff/is_dark_ruby_gem/blob/main/README_old.md "README_old.md file")
+Old versions of the gem are about static methods only, you can find old documentation about it all in [README_old.md file]( https://github.com/butteff/is_dark_ruby_gem/blob/main/README_old.md "README_old.md file")