refactor: fix Rake link and fix missing HTTPS on links
MODIFY
Makefile
Makefile
-# mruby is using Rake (http://rake.rubyforge.org) as a build tool.
+# mruby is using Rake (https://ruby.github.io/rake/) as a build tool.
RAKE = rake

MODIFY
build_config/ArduinoDue.rb
build_config/ArduinoDue.rb
# Cross Compiling configuration for Arduino Due
-# http://arduino.cc/en/Main/ArduinoBoardDue
+# https://arduino.cc/en/Main/ArduinoBoardDue
#
# Requires Arduino IDE >= 1.5
MRuby::CrossBuild.new("ArduinoDue") do |conf|

MODIFY
build_config/chipKITMax32.rb
build_config/chipKITMax32.rb
# Cross Compiling configuration for Digilent chipKIT Max32
-# http://www.digilentinc.com/Products/Detail.cfm?Prod=CHIPKIT-MAX32
+# https://www.digilentinc.com/Products/Detail.cfm?Prod=CHIPKIT-MAX32
#
# Requires MPIDE (https://github.com/chipKIT32/chipKIT32-MAX)
#

refactor: fix Rake link and fix missing HTTPS on links