Remove GC.start required by ruby_memcheck
As of version 1.2.0, ruby_memcheck no longer needs the call to GC.start
at exit. It will do it automatically.
# - NOKOGIRI_GC: read more in test/test_memory_leak.rb
#
-# make sure we do one final major before the process exits (for valgrind)
-at_exit { GC.start(full_mark: true) } unless ::RUBY_PLATFORM == "java"
-
require "simplecov"
SimpleCov.start do
add_filter "/test/"
