Don't skip installation if upgrade flag is provided

Don't skip package installation if upgrade flag is provided (--upgrade) but version it's not provided.
Package will be updated to latest.

Author: lukeseawalker

CHANGELOG.md

@@ -1,5 +1,9 @@
 # pyenv Changelog
 
+## next
+
+- Allow package update to latest if upgrade flag is provided but version it's not. 
+
 ## 3.3.2 (2020-08-05)
 
 - Do not attempt to rehash in a system-wide install

resources/pip.rb

@@ -98,8 +98,10 @@ def require_install?
     end
 
     unless new_resource.version
-      Chef::Log.debug("already installed: #{new_resource.package_name} #{current_version}")
-      return false
+      unless new_resource.options.split(/\s+/).include? '--upgrade'
+        Chef::Log.debug("already installed: #{new_resource.package_name} #{current_version}")
+        return false
+      end
     end
 
     if current_version != new_resource.version