Rename 2.0.0-pre to 2.0.0.pre

Only dots are used when separating versions in Rubygems.

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Master (Unreleased)
 
-## 2.0.0-pre (2020-10-22)
+## 2.0.0.pre (2020-10-22)
 
 * Update RuboCop dependency to v1.0.0. ([@bquorning][])
 * **(Potentially breaking)** Change namespace of several cops (`Capybara/*` -> `RSpec/Capybara/*`, `FactoryBot/*` -> `RSpec/FactoryBot/*`, `Rails/*` -> `RSpec/Rails/*`). ([@pirj][], [@bquorning][])

lib/rubocop/rspec/version.rb

@@ -4,7 +4,7 @@ module RuboCop
   module RSpec
     # Version information for the RSpec RuboCop plugin.
     module Version
-      STRING = '2.0.0-pre'
+      STRING = '2.0.0.pre'
     end
   end
 end