Readme.md in parallel-0.5.17 vs Readme.md in parallel-0.5.18

@@ -7,11 +7,11 @@
 
 Usage
 =====
     # 2 CPUs -> work in 2 processes (a,b + c)
     results = Parallel.map(['a','b','c']) do |one_letter|
-      expensive_calculation(letter)
+      expensive_calculation(one_letter)
     end
 
     # 3 Processes -> finished after 1 run
     results = Parallel.map(['a','b','c'], :in_processes=>3){|one_letter| ... }
 
@@ -47,10 +47,10 @@
  - JRuby / Windows support <-> possible ?
 
 Authors
 =======
 
-### [Contributors](http://github.com/grosser/parallel/contributors)
+### [Contributors](https://github.com/grosser/parallel/contributors)
  - [Przemyslaw Wroblewski](http://github.com/lowang)
  - [TJ Holowaychuk](http://vision-media.ca/)
  - [Masatomo Nakano](http://twitter.com/masatomo2)
  - [Fred Wu](http://fredwu.me)
  - [mikezter](http://github.com/mikezter)