README.md in ga-0.1.0 vs README.md in ga-0.1.1

@@ -29,11 +29,10 @@
 * `Unit#initialize(genome)` need copy genome
 * `Unit#fitness` return fitness
 * `Unit#fitness=` #set fitness
 * `Unit#cross!(target_unit)`
 * `Unit#mutate!`
-* `Unit#<=>(target_unit)`
 
 ```
 class Unit
   include GA
 
@@ -61,19 +60,15 @@
     (rand(3) + 1).times do
       i = rand(3)
       genome[i] = (genome[i] + rand(3)) % 3
     end
   end
-
-  def <=>(target)
-    self.fitness <=> target.fitness
-  end
 end
 ```
 
 ### Evolve
 
-`Unit#evolve(total_units, generations, crossover_rate, variation_rate)` return latest units
+`Unit#evolve(total_units, generations, crossover_rate, muration_rate)` return latest units
 
 ```
 units = Unit.evolve(32, 100, 0.8, 0.15) 
 best = units.max
 ```